I believe Madrid would be the only possible threat. The Oil Clubs will only be able to throw cash his way, and I doubt that'll be enough, he probably wants titles, CLs etc.
Especially if we (by the grace of God) manage to win the CL next season I can't see him leave for a very long time. Maybe Pogba having won it all too early a la Balotelli, would be tempted to leave to the likes of PSG.