West Ham boss David Moyes hopes an injury suffered by Jarrod Bowen isn't serious.
Bowen picked up a knock in the win at Wolves ahead of this week's Europa League quarterfinal against Bayer Leverkusen.
Moyes said: "Jarrod got a knee into his hip or into his ribs.
"I know if he's had that he'll be incredibly stiff and it could restrict his movement, so I'm going [to have to see], but as everybody knows we need those top players to be firing on Thursday night and Jarrod is one of them."
He added: "Wolves has always felt a difficult place to come to.
"They've had some really good teams here over the years and they've got a big atmosphere here as well.
"So, things went for us today and we got a decision right at the end of the game which might have gone against us."