The 25-year-old is on loan from Italian club Juventus but if he plays a certain amount of games, thought to be 14, and he has played eight, then the Hammers have to fork out big money for his services.
He has not been a unbridled success at the club but injuries have meant he has played more than his performances have merited, and now the club are seeking to renegotiate the deal, or even cancel it all together.
A Hammers source told the Sun: “We are currently in conversations aimed at changing the appearance clause or having it dropped altogether.
“We need the terms changing if the player is to remain with us.”
West Ham last week