Barcelona defender Dani Alves has warned Champions League opponents Bayern Munich that the "moment for revenge" has arrived.
The Spanish giants were on the wrong end of a 4-0 Bayern thumping in the first-leg of the clubs' semi-final tie and will need to be at their very best to reach next month's final.
However, only three clubs have ever managed to overturn a four-goal deficit in UEFA competition.
But Alves was refusing to let the score-line - or history - dampen his spirits, believing Barcelona had the capability to record one of the game's greatest comebacks.
"We must be 2-0 up at half-time, that's a minimum requirement" Alves told The Sun. "We'll give it everything. For us this match is like the final itself and we are obliged to give 200%.
"If we score quickly it will help us because that will get Bayern thinking and nerves could set in.
"We are a team that increases its level of performance in our very worst moments and now we need to be at our very best.
"Bayern might be a big team - but so are we. And if the Germans arrive here relaxed in any way at all that will be a big error. Now is the moment for revenge."
And the Brazilian's call to arms resounded right throughout the squad.
"The comeback is very complicated. Bayern are a very good team but we'll try," Lionel Messi said. "We can reach the final but we need to soar in attack, take all our chances and try to put Bayern under pressure."
Midfielder Andres Iniesta added: "The defeat in Germany was a pain for us. It will be extremely difficult to pull back a 4-0 lead but, if any team can do it, Barcelona can.
"In Munich we didn't show up. Now we need to keep the ball and to be successful in front of goal. We must be more committed to this match than any other this season. We are ready to go to the limit."
Centre-back Gerard Pique said his team-mates needed to play with the exuberance and abandonment of children.
"This is a day when we should all become kids again to be as excited and hopeful as they are and lose our commonsense a little bit," The Spanish international said. "That might get us through."