Real Madrid president Ramon Calderon admits they cannot prise Cristiano Ronaldo away from Manchester United.

"We would like to have a player like Cristiano, but if he does not sign for us then it would not be a major problem," Calderon told Marca. "The club has said that they do not want to sell him and we cannot keep going back.

"One has to know when to stop these things in order to avoid the frustration that the fans could feel.

"His club have to want to and if they want to negotiate with Madrid or any other club then they will."