James Milner says Manchester City must be wary of a wounded Manchester United when they meet in the FA Cup.

United have lost the two most significant meetings between the clubs and the England midfielder is concerned about their threat.

"That will have hurt them badly," Milner said. "Everyone, from the players to the management, will be more than up for it. As much enjoyment as we got from it, they probably felt three times as much pain. We have got to be aware of that.'"