Sammy McIlroy believes Wayne Rooney could face a tough time if he makes the move across Manchester.
United boss Sir Alex Ferguson confirmed in a statement that Rooney's representatives had told chief executive David Gill on August 14 that the player wanted to leave Old Trafford.
Barcelona, Real Madrid, Chelsea and Manchester City have all been linked with moves for the England striker.
City boss Roberto Mancini this morning insisted there had been no contact with their rivals over Rooney - but McIlroy would not rule out the player moving across the city.
He told BBC Radio Five Live: "It's an unbelievable situation. Carlos Tevez has done the same thing and at the moment has done very well.
"But to go just across the water with the fans at United loving him, he could be in for a rough ride."