Striker Diego Costa has been left out of the Chelsea squad to face Leicester on Saturday after a dispute with a coach over his fitness.
The Spain international has not trained for three days and has not travelled for the Premier League leaders’ match with the champions (17:30 GMT).
The news comes amid reports he is the subject of an offer to move to China that would be worth £30m a year.
Costa, 28, has scored 14 goals and provided five assists this season.
Costa joined the Blues for £32m in 2014, and was understood to be close to a return to former club Atletico Madrid after a difficult 2015-16 campaign.
“Did I want to go? Yes, yes, I was about to leave,” he said earlier this month. “But not because of Chelsea.
“There was one thing I wanted to change for family reasons but it wasn’t to be, and I continue to be happy here.”
Shortly afterwards, manager Antonio Conte said he believed the striker was now “completely focused” on “fighting for this club and for his shirt”.
He added: “When Diego decided to stay, I wasn’t concerned. He is showing great patience in the right way, in every moment of the game.”
Midfielders Jon Mikel Obi and Oscar recently left Chelsea for Chinese clubs – Tianjin TEDA and Shanghai SIPG respectively – while ex-Manchester City and United striker Carlos Tevez joined Shanghai Shenhua from Boca Juniors in a deal reportedly worth £310,000 a week.