Chelsea midfielder N'Golo Kante has been linked with a move to Barcelona once his contract expires next summer.
The defensive midfielder has had a frustrating season for the Blues, featuring in just two Premier League games due to injury. The former Leicester City man suffered a further setback ahead of Chelsea's Champions League clash with AC Milan on Tuesday night and will miss the match at the San Siro.
"Hakim is ill, N'Golo we're just waiting," Graham Potter said in the pre-match press conference. "He had a reaction in training, so we're just waiting for the news on that. Hakim has a sore throat, that's why he didn't travel.