Maybe a bit more experience in defence needed (Evra/RF), maybe Carrick in midfield too. Depends on injuries too obviously, don't know if Nani, Ando, Roo are ready. Maybe Lindegaard in goal if he's recovered from illness. Scholes weren't on bench yesterday so maybe he's injured too.
With most of the squad coming back now (apart from Vidic & Young), Fergie has enough players to choose two starting eleven, so hopefully it will be a strong and experienced team out tomorrow night. Although no one really wanted a replay, this game comes at a good time for the likes of Rooney, Ando, Nani because it's a game under their belts.