Nemanja Vidic's agent has said his client is considering leaving Manchester United after the World Cup and has yet to decide whether he wants to stay with the deposed Premier League champions.

After several months of his strenuously denying the perception that he may want to move to Spain or Italy, a story that originates from the very top at Old Trafford, Vidic's position has considerably altered, according to Paolo Fabbri, to the point where he is open-minded about a summer move.

Real Madrid are among the clubs who have been linked with the Serbia international, whose position is known to United's management and has led to Sir Alex Ferguson telling colleagues that he does not think the 28-year-old wants to stay in Manchester.

"We are waiting for Nemanja to tell us what we he wants to do," Fabbri said. "We are waiting as it is up to him. He is concentrating on something else [the World Cup] so I guess it won't be until after the World Cup he makes a decision on his future. We have requested some time from Manchester United to think about things and Nemanja does not want to look at things until after the World Cup. Any eventual transfer will take place only after the World Cup."

Vidic, who is preparing for Serbia's opening Group D match against Ghana on Sunday, has two years to go on his contract, the point at which United usually open talks about a new deal with players they want to keep. Wayne Rooney, for instance, has been assured that talks will begin about a £150,000-a-week offer after the World Cup. Vidic, however, has received no such guarantees, with United reluctantly accepting they may have to choose between getting up to £30m for him now or risk losing him as a free agent in two years.

Fabbri was asked directly about whether Real Madrid had been in touch since José Mourinho took over as manager. "I don't know," he said. "We have not heard anything official from Real Madrid. And Nemanja has requested I do not speak about particular clubs while he is at the World Cup."