Manchester United will be wary of Manchester City captain Carlos Tevez this Wednesday.
United No2 Mike Phelan is quick to acknowledge how important the Argentine has become to City since his arrival last year.
He said: "I think Carlos has taken up the challenge to be a City player. He has moved on. He did his work here and then took the opportunity to move.
"He has done that and I think he has done fairly well. He will understand the derby element of the game."