Jose Mourinho has taken a swipe at Eidur Gudjohnsen and accused Barcelona's former Chelsea striker of learning to dive in Spain.
Mourinho made a reference to Gudjohnsen's dramatic tumble which earned Barca a penalty in Saturday's win against Recreativo Huelva.
The city of Barcelona has still not forgotten Mourinho's jibe last season when he accused striker Lionel Messi of play-acting.
With heavy sarcasm, the Chelsea manager talked of the Catalan capital as a very cultural place with lots of theatres and fine actors.
Messi appeared on the front page of Barcelona newspaper Mundo Deportivo today, posing as Hamlet with a skull in his hand.
The cheat row was then stoked up by Mourinho, who warned Italian referee Stefano Farina to be wary of Barca's tricks.
Mourinho said: 'I know the number of penalties they have at home. I know the number of times they play against 10 players.
'I am surprised with Eidur because he played in English football all his professional life and three months later he gets that penalty.'
Asked whether the Nou Camp could expect more theatre tomorrow, he said: 'Ask Eidur.'
He then claimed Gudjohnsen, who spent six years at Chelsea before his summer transfer, would have been ridiculed in England for taking such a dive, when he was never touched.
Mourinho said: 'It is a tribute to English football because, in England, players are not allowed to do that. If players do that in England, you will kill them.'
Chelsea's Didier Drogba was booed by his own fans last season when he dived to try to win a penalty against Manchester City.
Mourinho urged referee Farina to be on top of his game because tomorrow's grudge match at the Nou Camp will have a worldwide audience of millions.
The Chelsea boss said: 'There are three teams who want to be the best team on the pitch.
'Chelsea want to be the best on the pitch, Barcelona want to be the best on the team and Mr Farina and his assistants want to be the best on the pitch.
'If that happens the game will be fantastic.
'We all have a big responsibility because all around the world the people want to see this game.
'They don't want to see Bayern Munich against Porto or Spartak and Inter or Olympiacos against, I don't know who.
'The game the world wants to see is Barcelona against Chelsea.'
A win for Chelsea in the Nou Camp would pile the pressure on Barcelona, who lost at Stamford Bridge two weeks ago and have four points from their first three games.
Werder Bremen are level with Barca and five points adrift of Mourinho's Group A leaders with Levski Sofia at the bottom without a point.
Mourinho said: 'It's not knock-out. It's a group. We don't play to kick each other out of the competition. We play to progress.
'Our target is to finish first in the group and it's not my problem if it's Barcelona or Werder Bremen who finish second.
'We need two points. We have three matches to get what we need to qualify automatically.
'We know our last game is at home against Levski but of course I would prefer to qualify before the last game.
'This is a game we will play to win. We want three points.
'The only meaning of a double over Barcelona is that we are top of the group.
'I don't have a personal situation with Barcelona. I'm not trying to help Werder Bremen to knock Barcelona out. That's not my fight.'
Mourinho is confident his new-look Chelsea team are starting to fulfil their potential.
The victory at home to Barcelona boosted self-belief and expensive summer recruits Andriy Shevchenko and Michael Ballack are starting to show their true class.
Mourinho said: 'We are a team with more experience.
'We can split our squad into two groups. One with high level players with a lot of experience between 27 and 30, at a mature age who have adapted to the needs of big matches and big competitions.
'We have another group of young boys full of talent like Mikel (John Obi) and (Salomon) Kalou, working to be part of our vision.
'We have lost some good players from our squad but we are happy with the players we have.
'I don't see any of my players in bad shape at the moment. Everybody is improving and getting their form.
'The new people are ready to give more. Ballack is a good example of the way we are playing now.
'Last season we were a team who always played 4-3-3 but this season we are able to play different ways.
'We can play 4-4-2 or 4-3-3, with a diamond in midfield or two lines. We are more mature in tactical terms.'