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.”
Former Swansea caretaker boss Alan Curtis believes Carlos Carvalhal deserves great credit for the impact he has had at the club.
West Ham have issued life bans to five pitch invaders who came onto the playing surface in the defeat to Burnley last time out.
Brighton centre-half Shane Duffy says his game has come on leaps and bounds thanks to Chris Hughton and Martin O'Neill.
Bournemouth midfielder Lewis Cook says he is ready to take his chance with England should he be handed his senior debut.
Tottenham will have to make a massive offer to land Wilfried Zaha, according to former Crystal Palace chairman Simon Jordan.
Nigel Clough believes keeping Burton in the Championship this season will surpass the achievements of last term's survival.
Garry Monk has challenged his Birmingham players to maintain the high standards they set when beating Hull in their last league game.
Former manager Mark Warburton claims Rangers need to be patient with Graeme Murty or suffer the 'same old problems'.