Liverpool striker Sadio Mane suffered a dead leg in his side's 2-1 win at Chelsea, boss Jurgen Klopp confirmed.
The in-form frontman, who has scored six goals this season, hobbled off in the second half at Stamford Bridge on Sunday with the problem, which was two-fold.
"It was a knock on the bone, around the knee, and a dead leg – that's an awful combination," Klopp said.
"That is not a slight on Emerson, everyone wants to play this game to fair play. But those things shouldn't happen.
"Christensen is a bang on the knee which we need to assess. It was a shame to use up the two subs in the first half.
"I can't give you any more than that – the doctor will assess. The first thought is that it's not too bad but we will see."
