Nottingham Forest will be without striker and top scorer Taiwo Awoniyi when they host Brighton and Hove Albion on Saturday (25 November).
The 26-year-old Nigeria international has scored four goals in 11 appearances this season and has been a key player in boss Steve Cooper’s side.
But Awoniyi has been trying to manage a groin injury since suffering from it last month and even played for his country in the 1-1 draw with Lesotho last week.
He has since withdrawn from the squad and has now gone under the knife, with Cooper ruling out a return for months after Awoniyi had groin surgery.
Cooper said at a press conference: “It’s bad news on Taiwo. He’s had to have surgery and he is going to be out for months.
“We’ll support him and try to get him back as quick and as fit as he can be but it’s a really unfortunate situation and a blow for him.
“He’s become an important player for us with the goals he’s scored and the goals he will score for us.
“But he’s such a good guy and a good professional who is desperate to do well so to get an injury like this is harsh on him.
“We’ve got to support him through the process of coming back stronger. He’s done that once before here and I’m sure he will give everything again like he did last time.
“You think about how well he did when he returned last season. I’m sure that’s given him a good reference point to come back to.
“We’ll definitely see him again this season but it’s a groin surgery so it will take a little while.”