Chelsea head coach Maurizio Sarri hopes to have N'Golo Kante back for a potential Europa League final after conceding he made a mistake playing him against Watford.
Kante was forced off with a hamstring injury after just 10 minutes in the 3-0 victory over Watford at Stamford Bridge on Sunday, where second-half goals from Ruben Loftus-Cheek, David Luiz and Gonzalo Higuain proved decisive.
However, Sarri suggested the midfielder could be available for the Europa League final in Baku on May 29 should Chelsea advance.
"The problem is with his hamstring. But I think that I made a mistake because, probably, today he had to rest," Sarri told a post-match news conference.
"Sometimes it's very difficult to put on the bench a player so important like [Eden] Hazard, like Kante, but you have to do it. Otherwise, you [are taking a] risk, and I have to say that I made a mistake.
"I don't know [how severe the injury is]. We have to wait until tomorrow morning. I think it's very difficult to recover him for the next two matches. But we want to play in the final, so he's lucky. We have to try and recover him for the final in case [we get there]."
Chelsea's win sent them third in the Premier League and to the brink of a top-four finish that would guarantee Champions League qualification, though the Europa League offers an alternate route into the continent's premier club competition.