"The Milan game is a lesson on what not to do. It's not a final being played in Paris. The team has to come back with the guarantee of going through, there will be another match at Camp Nou," the former defender told Marca.
"The most important thing is to score at the away ground, come back with a goal in the bag, more than a win. That would make things difficult for PSG, although we had the experience of what happened in the Copa del Rey with Real Madrid [Barca lost 3-1 at home].
"It will be very interesting because both teams have a huge amount of potential, with regard to attacking. PSG demonstrated that at the Mestalla stadium in the last 16 round, although then, in Paris, they tried to make the result secure."
PSG beat Valencia 2-1 at Mestalla in the round of 16, before recording a 1-1 draw at home to ensure progress.