Liverpool midfielder Fabinho was forced off the pitch with an injury in the first of his team's encounter with Aston Villa on Tuesday.
The Brazilian exited in the 30th minute and was replaced by Jordan Henderson.
He appeared to clutch his thigh before limping off, though the Reds have not confirmed the nature of the problem.
The bigger picture
While the extent of Fabinho's injury remains unknown, any time missed beyond Monday would be a cruel blow for player and club.
Liverpool will compete in the FA Cup final on Saturday against Chelsea and the Champions League final on May 28 against Real Madrid.
Next Match
Fabinho has been a key part of the team in recent seasons, appearing in 46 matches across all competitions in 2021-22.
What did Jurgen Klopp say after the match?
"I think he will [be OK, for the FA Cup final] but I do not know," the manager told BBC Sport. "We have to have a further assessment."