Thibaut Courtois did not show up for training on Monday as had been expected.
New Blues boss Maurizio Sarri had expected to speak to the Belgium international as rumours over his future with the Premier League club continue to swirl.
Sarri said after the Community Shield defeat by Manchester City on Sunday that he wanted to see Courtois face to face after his agent said last week that he wanted to leave Chelsea and join Real Madrid.
Courtois has regularly addressed his desire to return to Madrid, where he previously played for Atletico and where his two children live with his former partner.
Speaking on Sunday, Sarri said: “I have no reaction on the agent. I am not interested in the agent, I want to hear Courtois. If Courtois tomorrow (Monday) tells me the same, I have to speak with the club.
“I want only players with a high level of motivation. I don’t have an answer for the agent.”
Courtois was due to return to training with the rest of Chelsea’s players who made it to the closing stages of the World Cup.
The club put up a gallery of images from Cobham, which included shots of Courtois’ international team-mate Eden Hazard, Ngolo Kante and Olivier Giroud.
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