Sports director Leonardo explained PSG's embarrassing 1-0 league defeat at battling 10-man Stade Reims on Saturday by saying: "Maybe we have a team made for Europe, based on talent and passing quality, not for that kind of game."
PSG indeed looked a different side from the one who beat Valencia 2-1 away in the first leg and their chances of success in Wednesday's home game have been hurt by suspensions to striker Zlatan Ibrahimovic and midfielder Marco Verratti.
The Ligue l leaders' defeat by Reims was the second in a row against a lowly team after they were humbled 3-2 by Sochaux before back-to-back wins against arch rivals Olympique Marseille in the league and French Cup.
The Brazilian's return would be a boost to PSG, who could have all but sealed their last-eight qualification in Valencia if they had made more of their domination before allowing the Spaniards to pull a goal back late on.
"We know how Paris play. I watched their last two games and they often rely on the counter attack, allowing the other team to have the ball and breaking very well," Valencia full-back Jeremy Mathieu said.
"Valencia's tactics are to pressure as much as possible and spend as much time in the opponent's half as we can," added the Frenchman, who returned from a lengthy injury break at the weekend and could play alongside Victor Ruiz at centre half.
"I think the PSG match will be crucial for us to discover what level we are at. There are only strong teams left in the Champions League now, so we have to show we belong here," he told UEFA's website.
"The best music I know is the Champions League anthem. Personally, it always gives me goose bumps, listening to that music and standing in line before the game - even sitting on the bench. It means I am at a good club and I am a part of this."
