Their Wednesday's crushing victory over Bayern Munich means Barcelona are now clear favourites to take their place in the Champions League semi-finals, but striker Thierry Henry is not getting too carried with the result. "We've seen many things happen in the Champions League and we cannot be sure of anything," said the Frenchman.

"You can always lose, but we have to give it everything on the pitch. And when you play like that, everything is easier."

Bayern had beaten Sporting Lisbon 12-1 on aggregate in the previous round, but it was their turn to be crushed on Wednesday night as they slumped to a 4-0 first leg defeat at the Nou Camp.

Barca midfielder Andres Iniesta, whose side remain on course for a trophy treble this season having already reached the Copa del Rey final and built a six-point lead at the top of La Liga, said: "We were very effective and we've played one of our most complete games here.

"We've come away with a very good result, but as always there are more games coming up and we have to at least maintain the same attitude that we had this Wednesday.

"We will give it everything to have a good game in Germany."

Barca coach Pep Guardiola too was cautious ahead of next week's return meeting in Germany. "We shouldn't take the second leg for granted despite our advantage," the coach said.