Liverpool lost Senegal international forward Sadio Mané to injury during Saturday afternoon's 3-1 Premier League victory over Merseyside rivals Everton.
Mané's left leg buckled beneath him as he attempted to block a clearance from Everton left-back Leighton Baines shortly before the hour at Anfield.
Mané forced off after an hour of Liverpool's derby win
After receiving treatment, the 24-year-old collapsed to the ground as he limped towards the touchline, before Divock Origi came on in his place.
Mané had broken the deadlock early on with his 13th league goal of the season, with Philippe Coutinho then restoring the hosts' lead after Matthew Pennington's leveller for the Toffees.
Origi completed the scoring shortly after coming on to see the Reds move provisionally up to third place in the English top flight.