Although Celtic boss Neil Lennon claims "Forster is good enough to play for England", the Hexham-born goalkeeper knows playing in the Scottish League meant he was never in with a shout of getting the call for Euro 2012.
The Toon 'keeper has spent the last two seasons in Glasgow on loan and the Hoops have already agreed a £2million fee for a permanent deal.
But Forster has given a "come and get me" call to Premiership club looking for an experienced goalkeeper.