Goals in each half from Alexis Sanchez and Cesc Fabregas were enough for Barcelona as they strolled to a 2-0 Champions League victory over Benfica in Lisbon, but a late injury to Carles Puyol dampened what was a straight forward evening. Puyol fell awkwardly on his arm in the closing stages, and is now a doubtfor this weekend's Clasico clash against Real Madrid.