The Dutch keeper has been in superb form for Newcastle this season and has gained interest from a number of interested parties, including several German sides and Italian side AC Milan.
Milan are keen to find a replacement for Christian Abbiati, who is edging closer to retirement, and Clarence Seedorf has indicated his fellow countryman as the perfect option.
Krul is happy on Tyneside, but he is desperate to become Holland's No 1 goalkeeper, and he knows playing in the Champions League with a top Italian side would boost his hopes.
He is certainly good enough.
It is understood Mike Ashley has put a £10m valuation on his head, as the Newcastle owner again says every player has his price.
Ashley wanted £20m for Yohan Cabaye last January, and finally settled for £19m.
Sadly that £19m has not been reinvested, and that has been a source of concern amongst supporters.