Liverpool manager has voiced his concerns about the fitness of midfielder Fabinho following an injury.
The Brazilian started in the meeting with Aston Villa on Tuesday but was forced off inside the first half as he went down with a suspected muscular issue.
Ahead of Saturday's FA Cup final against Chelsea, Klopp appeared unsure about his midfielder, who has made 46 appearances in all competitions this season.
When asked if he would be fit to make the game at Wembley, the Reds boss said: "I don't know, he felt a muscle, not too much. It was not the thigh, but the other side (hamstring). He is quite positive but I'm not sure what I can take of that, to be honest. We will see," as quoted by the Evening Standard.
"I can't say when he'll be ready. Nobody has an answer for that. He has a good feeling and that gives me a better feeling than I had when I took him off."
The 28-year-old has featured 168 times for Liverpool since his arrival in 2018, helping them win a Premier League title and a Champions League before adding an EFL Cup winners' medal to his record earlier this season.
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