The 27 year old Senegalese international joined The Magpies from West Ham on a free transfer last season.
But we all know about the infamous "release clause" ... and Alan Pardew is ready for the queue to form.
Galatasaray official Bülent Tulun is currently in England to discuss a potential move.
The Lions are coming off the back of a title winning season, Galatasaray will be using the lure of a lucrative salary, Champions League as well as first team football to try and secure a deal.