Calderon: Decision is Ronaldo's

Real Madrid are maintaining their pursuit of Cristiano Ronaldo despite the news the Manchester United winger will miss the start of the new season after undergoing surgery on his ankle.

The Spanish club's president Ramon Calderon said he was aware of Ronaldo's problem, and that if the 23-year-old wanted to leave Old Trafford then United would find it difficult to keep him.

"It depends on the player, on Ronaldo. Since I've known football it has been the case that the desires of the footballer are what decide matters," said Calderon. "If Ronaldo wants to leave Manchester, he'll leave. If he wants to stay, he'll stay."

He added: "I don't think you can keep anyone in a place where they don't want to be, not even in a family.

"But I insist that for a formal negotiation to start Manchester United will have to open their doors to us. Manchester have to want to talk."

On Ronaldo's ankle injury, Calderon added: "At the moment that is something which should only concern the player and United."

Ronaldo underwent surgery on his right ankle on Monday but it will be at least a month before Professor Niek van Dijk, the Dutch ankle specialist who operated on him, can assess when he will be ready to return to action.

Van Dijk is one of the world's foremost experts in ankle injuries, and is a former head of the Dutch Squash Federation's medical committee. He operated on the Portuguese winger at the Academic Medical Centre in Amsterdam.

United said in a statement afterwards: "Cristiano Ronaldo underwent surgery to his right ankle and the initial indications are that the procedure was successful. Cristiano will begin his convalescence under the direction of club medical staff and an estimation of his return to full fitness will be possible following review by the specialist in one month."