West Ham United striker Andy Carroll is facing an extended spell out due to an ankle injury which could require surgery, says manager David Moyes.
It is not known how long the forward will be sidelined but the minimum is likely to be a month, and it could be much longer.
Carroll has only made one substitute appearance since scoring twice against West Brom on 2 January.
"To lose him is certainly a big miss," Moyes said.
The injury is likely to end any hope the 29-year-old has of moving during the current transfer window.
Chelsea had been linked with the former Newcastle and Liverpool striker, although manager Antonio Conte has refused to discuss any interest in the player.
Moyes, speaking before his side's Premier League match against Bournemouth on Saturday, explained the extent of the problem.
"We found out yesterday after Andy went for a scan and it showed up that he has got a problem," he said. "We are not sure whether the ankle will need an operation or not.
"We are getting two or three specialists to look at it and then we will be able to make the correct decision. Hopefully we will know within a week."
Carroll has featured 14 times for the Hammers this season.
"To lose him takes away a big part of our armoury," Moyes added. "It is frustrating for Andy, but it is frustrating for us.
"Andy gives us another option and alters the way other teams play against you."