Mancini is convinced his squad is short of depth.
When asked if he might consider investing in new faces, Mancini said: "Probably. We can't sell players. We don't have enough players to play if we sell players.
"We can have a problem because we lose three players and we have Micah Richards, I don't think he play until the end of February.
"Jack Rodwell - we don't know when he can play. Maybe we can recover Aleksandar Kolarov in two weeks. We will see this in next days."