England legend Peter Shilton says Ben Foster must quit Manchester United for the sake of his career.

Foster is almost certain to miss the World Cup after falling behind up Manchester City's Joe Hart, who has been a success on loan at Birmingham.

"Foster was on a par with (Robert) Green a while back but he is not playing first-team football anymore and that is going to count against him," Shilton told the Daily Mail.

"He played in goal for the Brazil friendly last November and did very well, but not playing regularly has put a big question mark over him again. 'I feel he may miss out this summer and although he does not want to leave a team like Manchester United, he may have to. It depends how long he wants to hang around not playing. It's going to be a big decision, as who knows when Van der Sar will retire?"