West Ham United boss Sam Allardyce fears losing Momo Diame next month.

Allardyce would not be drawn on the speculation regarding a buyout clause in Diame's agreement, but did admit a big offer would leave the club "powerless" to stop him leaving.

"I don't disclose players' contracts publicly - there's always a situation where you're powerless to keep a player because of the size of the price," he said. "You can't turn it down - the chairman says, 'Look, we can't turn that down, Sam - we've got to move him on'."