Promotion-chasing Norwich City's in-form striker Lewis Grabban is set for a spell out for an ankle operation.
The 27-year-old, who has five goals from his last five Championship games, will undergo the surgery on Thursday.
It is not known how long he will be out for, but boss Alex Neil is hopeful of a return before the end of the season.
"It's a huge blow. But we've got a big squad and we're now looking for the other guys to step up to the plate," Neil told BBC Radio Norfolk.
"It's not actually clear what the problem is, so once it's fixed, we'll have a better idea.
"He's done very well for us in the last six games, but he's struggling with his ankle."
Grabban is City's second-highest scorer this season with 12 goals, and his effort in Sunday's 2-0 win over local rivals Ipswich Town helped take the Canaries to six consecutive wins.
But that run was ended by Wednesday's 1-0 loss to Wigan, in which Grabban, a summer signing from Bournemouth, was unable to play.
"He was fine after the derby, then he came in the other day and was struggling and said he couldn't walk on it," said Neil.
"The day after it was even worse. So we got it scanned and it showed up that he needed to have it looked at."