Forster will return to Newcastle United, with the keeper yet to secure a switch elsewhere.
He spent the 2009/10 campaign with Norwich City, and the last two seasons has put his feet up in the SPL with Celtic.
The Hoops are keen on doing a deal, but Forster wants to get out of the SPL.
West Ham United and Southampton are reported to be weighing up an approach, but - as yet - neither has made a move.
Alan Pardew: "At the moment he is coming back to us.
"He will be with us until he finds a club and we find a fee that works for us."