But Galatasaray insist the Dutchman 's future remains in Istanbul .
Galatasaray appointed former Italy manager Cesare Prandelli as head coach in place of Roberto Mancini last month .
But Galatasaray , who appointed former Italy manager Cesare Prandelli as head coach in place of Roberto Mancini last month , insist the Dutchman 's future remains in Istanbul .