Manchester United striker Wayne Rooney admits he's been hit by illness.

United will need to keep a close eye on Sunday's hero Rooney after he was forced to pull out of a book signing yesterday due to illness.

Rooney, who scored twice in the 3-2 win over City, wrote on Twitter: "Not feeling good at all. Had to cancel book signing today. Sorry to all the fans who were coming. I was looking forward to it."