Sadio Mane looks set to miss Wednesday's home game against Bournemouth after going off injured in Liverpool's 3-1 win over Everton on Saturday, manager Jurgen Klopp said.
"We don't know what Sadio has done but it doesn't look like he is going to be ready for Wednesday," Klopp told Sky Sports at Anfield.
"Hopefully it's not too serious. We will see."
Mane's left leg buckled beneath him as he attempted to block a clearance from Everton left-back Leighton Baines shortly before the hour.
After receiving treatment he collapsed to the ground as he limped towards the touchline, before Divock Origi came on in his place.
Liverpool were 2-1 up when Mane left the fray, the Senegal international having broken the deadlock in the eighth minute with his 13th goal of the Premier League season.
Origi made it 3-1 three minutes after replacing him.
Mane, 24, joined Liverpool from Southampton for a reported fee of £34 million ($42.7 million, 40 million euros) last June and has been one of their stand-out performers this season.