If he were to sign a new contract it might not be that he's demanded money, just that the club has offered it along with other terms to suit his plans. E.g. a reasonable release clause if a Champions League/title-winning club inquire after a certain date, freedom to leave if Saints fail to achieve x, y and z. You don't have to be a greedy mercenary for money to help make your decision. It's certainly not greedy to ask whether your current club value you as highly as your suitors.
But anyway, this claim about a contract has nothing to back it up yet.