Both teams will miss a lot of important players. Barcelona will play without suspended Puyol and injured Pique, so Marquez and Milito will probably start the game in first lineup. Also Ibrahimovic is injured and he can even miss the derby against Real Madrid. Iniesta seems to be back, but is not sure if he will start the game in the field or he will enter in the second half. The defense is weak for Barcelona, but I think the midfield will keep the ball a lot and will intercept a lot of important balls. Guardiola will have tho choose between Xavi, Iniesta, Yaya Toure, Busquets and Keita to play in the midfield. I think the best choice is to play with Xavi, Yaya Toure and Keita as they will gain more strength. Even if Ibrahimovic will miss the game, Bojan seems to be in good shape scoring 2 goals against Bilbao in the weekend. Alongside Messi and Pedro, Barcelona's offensive will be good enough to score some goals.
Arsenal will miss some of their important players, starting with suspended, but also injured Cesc Fabregas. Arshavin will also miss this game, and the English team will loose o lot in the midfield without these 2 players. I don't think they have too many chances starting the game with Denilson or Eboue in the midfield. Rosiscky is a good player, but he never was in his best shape as he is injured too often. Nasri is also a talented player, but he still needs more games to play at this level to have the needed experience. The defense will suffer as Gallas is also injured for this game. If Arsenal had their best squad they could have a good chance to qualify, but in these conditions I see them loosing this game by 2 or more goals. I don't even think they can score. However, I hope the Gunners will win the Premier League trophy this year, but we all know that Chelsea has the first chance.
Probable teams:
Barcelona: Valdes, Dani Alves, Marquez, Milito, Abidal, Xavi, Busquets, Keita, Messi, Pedro, Bojan
Arsenal: Almunia, Clichy, Vermaelen, Diaby, Sagna, Nasri, Denilson, Eboue, Rosiscky, Bendtner, Walcott