UEFA CHAMPIONS LEAGUE
Camp Nou, Spain
* Local time based on your geographic location.
4 - 0
2nd leg: 4 - 2 (Agg)
Thanks for joining us. We'll have the draw for the next round on Friday at 1100 GMT. See you then!
For the first time ever in the Champions League, a first-leg deficit has been overturned, and in some style too. Barcelona were exceptional, but Milan had their chances so will feel they have no-one to blame but themselves.
FT. BARCELONA 4-0 MILAN. Messi was the difference in the first half, Villa netted the key goal, then Milan weren't able to get back into the game despite some good chances. Alba finished them off and Barcelona are into the hat for the next round.
Oh, Mexes almost gets one back! He hammers a shot from way out, and Valdes was not getting there. But it flew wide.
An incredible piece of play from Robinho, who chose to take a short free-kick and left his team up the other end as Barca broke. Alba pounced and deserves a goal, he has been immense.
GOAL Messi took it, fed Alba and Milan were dreaming. Alba slips the ball under the goalkeeper and it's 4-0!!!
Terrible short ball and Muntari is caught on the ball... Barca break
Milan are pushing up for what could be their last chance. Puyol fouls Boateng, and the launched ball is coming...
Three added minutes
Messi takes over and tries to curl a shot in like he did for the first goal, but this time it is blocked. As Milan break, Robinho is furious that he was flagged offside.
Adriano breaks - he slips it to Iniesta and then runs inside and it breaks to Alves who tries to cross. The ball is deflected behind, but this will be a short one.
Barca fans are getting nervous. The jeers come as Milan control the ball and try to work an opening.
Montolivo swings the ball in, but Pique is there to stop Bojan and El Shaarawy in the box. This is the best that Milan have played in the game.
Messi and Busquets link up. Messi drives at the heart of the Milan defence, but slips the ball to Sanchez who loses it.
Milan controlling the possession and Adriano has to leap to head away with Abate lurking.
Sanchez is chasing the ball down, but he hasn't had much impact thus far. Milan look more likely to score at the moment and that would win them the game!
Alba again impresses in the attacking third and gets away and into the box, but the strength of Zapata holds him off and prevents the cross from coming in.
Pedro wanders off, Adriano comes on.
Pique stumbles when facing his own goal and almost loses the ball to the advancing Robinho.
Boateng jumps with Valdes for the ball, but there was only ever going to be one winner there and the goalkeeper claims the ball with ease.
Bojan works an opening down the left with a brilliant cutback. Robinho almost pounces on the ball, but Alba is there again to deny him with a fine tackle.
Robinho cuts inside and feeds Muntari on the edge of the box, but Alba puts in a crunching tackle to deny the Ghanaian.
Sometimes it looks like the ball is attached to Messi's foot via some string... this was one of those times as he dances away from about three tackles before eventually running out of room on the right.
A lovely ball through finds Alexis, who rounds the goalkeeper and scores. However, he is offside. Only just though.
Mascherano comes off, Puyol on.
Fantastic work down the left side for Barca. Alba and Xavi working an opening and Alba comes across to stop him.
Close call as Abate finds himself free on the right, but he is flagged offside. That wasn't far away.
An attacking change for Milan, who have to score. Sanchez will be fresh and should cause problems up front for Barcelona
Flamini off, Krkic comes on for Milan.
David Villa comes off, Alexis Sanchez arrives.
It's Messi and he hammers it right into the wall. The rebound comes back to him, but the chip over the top has too much on it.
Free-kick just outside the box. Could be Messi, or Xavi from this range...
Brilliant passing on the edge of the box, but Barca can't quite break though. In the end, Messi is fouled by Zapata and this is a good chance.
Mascherano with a commanding piece of defending as the last man to stop Robinho racing through. There could yet be a twist in this tale if Barca don't kill off Milan.
Barcelona celebrate Villa's third goal
Abate is becoming more of a force as he attacks down the right. Just needs to be careful that he's not caught out of position.
Excellent ball to Abate and some shaky defending from Barca to clear it. The ball bounced around a fair few times before Pique eventually managed to get it away.
Milan are attacking more now - they have to. The ball breaks to Boateng in the box and he could have shot, but chose to try and set Flamini away and overhit the pass.
Abate with a stunning cross considering how much pressure he was under at the time from Alba. Nobody home though for Milan.
Alba looks like he might get away, but he fouls Abate even though it might have been the Italian who pushed first.
Messi floats a free-kick in and Busquets is there to direct it back across the goal. Abbiati is there to claim it though.
Muntari's first task is to foul Messi. The little fella has taken a lot of contact tonight, but is still full of energy.
Messi takes control of the ball from 35 yards and has a dip. It flies over the bar, but the Nou Camp crowd thought that one was in.
Robinho and Muntari on, Ambrosini and Niang.
Milan are about to make some changes, and they need them as well.
Barca's triangles are coming out again. They are so good at keep hold of the ball and Milan are tiring now.
Messi takes it, turns, wriggles away, but is tackled by Montolivo just as it looked as if he might escape.
Now what happens? Milan had been decent this half and had pressed well. Now they need to get the ball back and attack, or they are going out.
Quite a performance from Barcelona tonight. They lead 3-2 and there can't be extra-time now!
Mascherano intercepted the ball, Iniesta slipped to Xavi, who hit it perfectly into Villa. Constant dived in, but missed it and the striker curled it sweetly into the far corner.
GOAL Villa with a cool finish after a pinpoint pass from Xavi.
Mexes in the book for a foul on Messi. He will miss the next game.
Boateng gets a chance from a corner, but hits the ball behind. A set piece would be a good point of attack for the away side
Messi slides the ball to Villa in the box. He tries a flick back, but Messi wasn't running onto it for once.
Ambrosini brings down Messi.. how dare he, shout the Barca fans. The Milan midfield has expended a lot of energy already.
Niang chases down a long ball and almost skips through, but just runs out of room in the box.
Mascherano comes across and helps out when Pique is robbed of the ball. He was needed as El Shaarawy was there.
Milan look a different side now. They are pushing and hurrying the Barca players. Sort of like the full court press in the NBA
Constant loses it and Messi is away. He charges away, but Zapata does well to stick with him and his shot is tame, well saved by Abbiati.
Milan are pressuring from the start. Lots of bodies pushing up and hurrying Iniesta on the ball.
No changes at the half.. Milan need to score at some point if they are to progress. But they might be praying for penalties to be honest.
KICK-OFF Barcelona get us underway again...
Lionel Messi celebrates after scoring his second goal against Milan
74% possession for Barcelona, that tells a story. But Milan will feel they have a goal in them, as Niang almost proved. If they score, Barca would need two more.
This has been a very entertaining tie so far, but the other game tonight is pretty decent as well. At half-time, it's Schalke 1-2 Galatasaray. Follow it here
Messi has been the real difference here. Such quality in his finishes, especially the first. Milan just haven't been able to cope with him.
HT. BARCELONA 2-0 MILAN. Messi's magic has ensured that the game is all square. Two wonderful goals and he Spanish side have been on top throughout. Milan, though, had one very good chance to end this tie, but missed it.
Flamini goes into the book for a poor foul on Pedro. He would miss the next game now as well
Alves loses it now, to El Shaarawy who should have done better when on the edge of the box. He's been poor this half to be fair.
Busquets feeds Alves, who gets a fine cross in but Villa can't quite direct it goalwards.
Constant brings down Alves again... he's struggled to contain the Brazilian so far this half.
Barcelona are back on level terms, and have been on top. They could now use the break to work out their plan of attack for the second half.
Pedro is booked for a foul on Abate. He would miss the first leg of the quarter-final now.
Incredible few minutes there. Milan so close to a vital goal, but now they are struggling.
It's 2-2, when it could have been 3-1 on aggregate seconds earlier. Iniesta robbed the ball, fed Messi who cut inside and hammered it through the legs of Mexes.
GOAL Messi again Another cracker. He smashes a shot past Abbiati.
That was a great chance, but the shot hammered off the upright. The ball came back in and looked like it could have been handled in the box by a sprawling defender.
Oh my. Mascherano loses it and Niang gets away.. he's through on goal. But hits the post!
Alba with good work down the left, he gets away and hammers it too far
Messi counters and slips it to Alves, who again tries to curl it and the cross finds no-one.
Lionel Messi avoids the attention of three Milan defenders to superbly fire Barcelona into the lead
Alves getting a bit frustrated and has a go from 30 yards. His shot flies wide and doesn't bother Abbiati.
Montolivo robs Messi and El Shaarawy is away. He cuts inside and goes for the shot, but drags it down and Valdes can save with ease.
Pedro is isolated up front for Barca. He's not good at holding the ball up, so the Milan defence have been on top of him right away.
Abbiati will be mostly pleased.. he's not had much to do bar picking the ball out of his net and saving from Xavi.
Alves in behind again on the right, but a long leg from Zapata clears the ball. Milan break and El Sharaawy should have fed Niang, but turned inside and lost the ball.
Messi races away, but is brought down by either Constant or Ambrosini.. foul, but no card.
Boateng has some space and crosses for El Shaarawy to hit it. He tries an overhead kick and miscues though.
Milan just getting back into the game a little and a better ball from Montolivo to El Shaarawy there would have resulted in a chance. It was overhit though.
Constant and Alves are having a right tussle. Meanwhile, Flamini needs to get another shirt as he appears to have bled on that one.
Messi has dipped a little bit of late.. Milan will like that, but are still on the back foot.
Zapata almost robbed by Iniesta, but the defender does well to keep control of the ball and stop his opponent running away with it.
Flamini is receiving attention on the side of the pitch. He seems to have a gash on his head, but will come back on to the pitch with a bandage.
Xavi frees Alves down the right and the cross comes in, but Pedro is not able to direct the header goalwards.
Barca's passing triangles are coming to the fore again. Just missing that final piece of perfection to get a shot on target.
Barca celebrate the opening goal
Alba has to clear up as Abate manages to get forward for what must be the first time this game.
Boateng in the book for a late one on Iniesta. He's already had a few so far, so that isn't a surprise.
Pedro gets it again in the box and seems to be tripped, but the ref again doesn't blow.
Free-kick to Barca, about 35 yards out. Xavi is over it and they tried a short pass behind the ball to Pedro, which was cut out.
Iniesta can't get away from Montolivo, but his quick feet are providing a lot of the incision into Milan's defence.
Another long ball to Alves, but there is a miscontrol. Back in possession again, Iniesta and Pedro with quick touches almost force an opening.
Messi dinks in a cross, but Busquets can't quite get on the end of his own header and it comes off Mexes and goes behind.
Xavi drills in a shot, but Abbiati got a hand on it and pushed it round the post. That hand was needed, as it was going in.
Abate with a horrible backpass from a long ball. Messi was chasing up and Abbiati missed it as Pedro arrived, but Zapata cleared.
Mascherano is winning the battle again Niang at the moment, but looks to be feeling the physical force of the striker.
Messi surrounded again, but like Maradona in his pomp, he comes away with the ball.
Barca's start could not have been better. They look capable of scoring every time they get into the final third.
Alves swings in the cross, headed back by Messi to Iniesta on the edge of the box. A wonderful hit, but Abbiati palms it away onto the post and Messi misses the follow-up header.
Niang gets it against Mascherano after a brilliant touch, but can't beat the Argentine.
Pedro raced onto the long ball in the box and is clattered over by Abate. No penalty, but there could well have been one there.
Great triangles again from Barca and Messi beats two men before being tackled just outside the box. Fans wanted a foul, but the ball was taken... just.
Alves has so much space down the right hand side, it is a profitable area for Barca at the moment.
Alves chips the ball to Villa in the box, but Abbiati is there to claim it.
El Shaarawy has a sniff as a ball inside finds him racing through into the box. Just went a little wide and Alves managed to get back. His shot was very tame and trickled into Valdes' arms.
Milan struggling to get their feet on the ball at the moment and are isolated up front when it arrives at the other end.
Pique spreads the ball to Alves, but Constant stops him and sends the ball up to Niang who is tackled by Mascherano.
Hard to see a better goal than that and Barca are purring now. Messi's ball to Villa finds him in the box, but Mexes comes across.
He just cut inside on his instep and picked his spot. He had FIVE players surrounding him, but bent the ball into the top corner. Incredible.
GOAL Messi. Wow. Passing, passing, on the edge of the box and a side footed wonder from the magic man.
Ouch, Busquets takes one in the ankle as Boateng arrives a little late. Just a free-kick though, nothing more.
Milan are pegged right back. Looking to break when they get the ball, Zapata hammers it up the pitch but Mascherano tidies up well.
The long ball out to the right is being favoured at the moment by Barca. Alves out there, but Messi drifting and Pedro as well.
Messi takes the ball, but FOUR Milan players swoop in on him. Man-marking, or team marking to be precise.
Yup... here comes the passing. Great ball from Mascherano to Alves, who falls and wants a foul but doesn't get one.
Milan lose possession almost immediately. Dangerous game that, as they might not see the ball again for some time.
KICK-OFF: Milan get us underway... Remember, they lead 2-0 from the first leg.
If you want to chat about tonight's games, then I suggest you join James Tyler in the Boot Room
The Nou Camp looks full to the brim and buzzing with noise. La Liga is virtually sewn up, but Barca fans want the Champions League as well.
The players are on their way out to the pitch now. Milan all in white, Barca in their home Blaugrana.
If Milan let the Catalans get into their passing stride, Messi will run riot. They need to frustrate and ensure that they don't get going. Barca are under pressure, so Milan need to keep that pressure going for as long as possible.
A goal for Milan and the tie is effectively over, as Barca would need to score four goals. Their best bet here is to sit back and frustrate, then counter attack with the pace of Niang and El Shaarawy
So, players to watch. For Milan, Constant at LB will need to be at his best to stop the drifting runs of the Barcelona strikers. For Barca, Villa up front has a lot to prove, while Pedro will also be a threat alongside Messi.
If one team is capable, it's Barcelona. Assistant Jordi Roura said before the game: "Milan are a big team, solid, complicated. The result of the first leg was severe, we want to turn it around."
Meanwhile, 28 teams have recovered from losing their UCL first leg to progress, but no team has ever overcome a two-goal first-leg defeat without scoring an away goal.
Milan are on a roll. They have only lost 3 times since mid-November and one of those was after ET, another was in the UCL once qualification had already been assured.
There is, of course, another game on tonight as Drogba and Galatasaray travel to Schalke. You can follow that one here
Those in danger of missing the quarter-finals if they get booked tonight. Barcelona: Adriano, Mascherano, Pedro, Song. Milan: Bonera, Mexes, Flamini, Montolivo.
Both sides are matching up as 4-3-3, but I think we'll only see one side properly attacking. Milan will want to hold what they have. You can follow me on Twitter here: @joncarterespn
Francesc Tomas has just one word for Barcelona fans: Believe. Meanwhile, Sumeet Paul hopes Milan can finish off the Spanish side.
All eyes, of course, are on Messi. Mainly because Balotelli is cup-tied. After FAILING to score against Real in the cup, he has 2 in 2 games. Or 40 goals in 27 games in La Liga if you prefer that stat.
Strong from Barcelona with a virtually full strength side out, save for Puyol's absence. That midfield is simply world-class, but Milan are well set up to defend their lead. Ambrosini and Flamini will have a busy night.
Barcelona team: Valdes - Alves, Pique, Mascherano, Alba - Xavi, Busquets, Iniesta - Pedro, Messi, Villa
AC MIlan team: Abbiati - Abate, Mexes, Zapata, Constant - Montolivo, Ambrosini, Flamini - Boateng, Niang, El Shaarawy
Graham Hunter on Xavi's hopes of inspiring an epic Barcelona comeback against AC Milan in the Champions League. Read it here
Messi was frozen out last time, but Barca will be looking for him to shine.
Join us at 1945 GMT to see if Barcelona can overturn a 2-0 defeat to seal progress to the next phase.