Brentford head coach Thomas Frank says the ankle injury sustained by Bryan Mbeumo against Brighton & Hove Albion is "bad" and he will be sidelined for a number of weeks.
The 24-year-old put Brentford ahead from the penalty spot with his seventh Premier League goal of the season before rolling his ankle and limping off in the first half as the Bees fell to a 2-1 defeat.
"It is bad," Frank told the club's official website. "He’ll have a scan later, but we don’t know the exact number of weeks he will be out.
"He will definitely not play on Saturday, and he will be out for weeks. We will know more in the next couple of days.
“[Bryan] must be number two after Ivan [Toney] in terms of goals and assists, which is key.
"His work-rate for the team is incredible; you don’t see many wingers who work so hard and mean so much.
“He’s become the key man – 'give me the ball, I’ll take this'. Who will that man be now? We’ll find out in the next weeks.”
Major blow for FPL managers
The extent of the injury is bad news for Mbeumo's owners in Fantasy Premier League.
He is the fourth most-owned midfielder in FPL, chosen in 31.8 per cent of squads, and he was due to face bottom club Sheffield United on Saturday.