Reports in the media have linked Liverpool with a move for Harper as understudy to Jose Reina but the 33-year-old's outstanding form as stand-in for the injured Shay Given means Magpies manager Keegan is loathe to lose him.

Keegan said: "I am not looking for him to go out, though I'm sure he would come and see me if Liverpool come and knock on his door.

"I'm not surprised if other teams are interested. Steve Harper is a very, very good goalkeeper.

"Everyone has always known that, but it's always been hidden by the fact he has not played."

Harper's performances have been one of the reasons behind Newcastle's recent upturn in form and their climb to 12th in the Barclays Premier League.