The absences of Eric Abidal and Adriano mean that basically every Barcelona lineup is a mystery. We can argue about the formation until we're blue in the face, but it's impossible to tell until they take the pitch. Even then, they're Barcelona, and the formation doesn't matter that much. If they play a back four, Carles Puyol will play left back. If not, he'll play left central defense with Daniel Alves as a right forward. Kevin-Prince Boateng and Clarence Seedorf return for Milan, while Massimo Ambrosini is in for the suspended Mark van Bommel and Alessandro Nesta starts in place of the injured Thiago Silva.
AC Milan Lineup (4-3-1-2): Abbiati; Antonini, Mexes, Nesta, Bonera; Nocerino, Ambrosini, Seedorf; Boateng; Ibrahimovic, Robinho
Barcelona Lineup (3-4-3): Valdes; Puyol, Pique, Mascherano; Busquets, Keita, Xavi, Iniesta; Sanchez, Messi, Alves
Kickoff is at 2:45 p.m. ET, 8:45 p.m. local time from the San Siro in Milan. You can catch the game on FOX Soccer Channel in the USA, Sportsnet World in Canada, and Sky Sports 1 in the UK.