He snubbed two offers to return to Holland in the summer, but we understand he has bigger fish to fry.
European giants Juventus and Bayern Munich are set to try to tempt him to European football.
And not only that, but several Premier League clubs are also after him.
With his contract at St James's Park expiring at the end of next season, and the fact he is unable to dislodge Harper as United's No1, has alerted clubs.
The 21-year-old could be hot property in the January transfer window.
He has made just three starts for United – in the Uefa Cup against Palermo as a 17-year-old, and two Carling Cup appearances this season.
Krul was warned last month by Holland Under-21 coach Cor Pot that he risks his international future while he warms the bench at Newcastle.
Arsenal head the Premier League interest, while in Holland, PSV Eindhoven, Feyenoord and Ajax are monitoring his progress.