Jurgen Klopp fears Mo Salah could miss Monday's trip to Burnley.
The Egyptian hit another double as Liverpool came from behind to beat Leicester on Saturday.
But Salah suffered an injury during the Anfield clash.
Klopp said: "He was limping at the end, and that's never a good sign. We will have to see what the problem is and what he can do for the next game."
Jamie Vardy opened the scoring with a third-minute opener but Salah hit a second-half brace.
And Klopp added: "It is a maximum satisfaction to win like this today and on perfect days we win football games. Today was pretty much perfect.
"When we were one goal down our reaction was the best I've ever seen in this situation. The crowd were unbelievable and we needed them today to score these two goals. Mo was fantastic with his dribbling and his vision. I couldn't ask more from him.
"Staying in the game is the real deal of football in this league but I am happy for Mo, I am happy for the team because this group is a fantastic group of players. It's a good team performance and a well deserved win."