Birmingham City boss Lee Clark rates Jack Butland in the £18 million class.

Butland has been linked with Arsenal and Tottenham, while Southampton had a £6 million offer turned down.

Clark feels recent events mean that Blues can demand significantly more money from any club aiming to take the keeper away from St Andrew's.

The 39-year-old manager said: "Has his stock risen? Of course. He was one of the stand-out players for Team GB and if he does get a cap, it will only enhance that.

"I wouldn't want to entertain talk of selling him. But if you've got an international cap you go into a different league.

"Six million just gets you a League Two goalkeeper - a full international you'd need to treble that."