West Ham will be without midfielder Lee Bowyer in the coming weeks as he is due to undergo hernia surgery on Tuesday.
But after scoring twice in West Ham's 5-0 win at Derby, manager Alan Curbishley has now booked the midfielder in for an operation.
"Unfortunately he's been one who's been playing with an injury," Curbishley told Sky Sports.
"He's having an operation on Tuesday, so he's going to be out for a while."
Bowyer has confirmed he is undergoing surgery next week, although it remains to be seen how long he will be out of action.
"I'm playing with a hernia. I get that done on Tuesday," Bowyer said.