The Belgium global has had an extended period away after finishing third with his nation at the World Cup.
Speculation has been rife this summer that Courtois is angling for a return to the Spanish capital - where his children live - with Real Madrid heavily linked with a 35-million-euro move for the Belgium global.
Chelsea kick off their 2018/19 Premier League campaign on Saturday afternoon with a trip to Huddersfield Town.
Thibaut Courtois has gone AWOL from training as the goalkeeper attempts to force an exit from Chelsea this summer, reports say. "Yes, my desire is to stay at Milan - I don't have any other,". "He knows what I want, I know that he tries to do the best for me and I still have a few days to wait [and see] what is going to happen".
Speaking on Sunday, Sarri said: "I have no reaction on the agent".
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"Since the beginning, he told me he loved Chelsea", he said.
Chelsea FC have won the Premier League title twice in the past four seasons under Antonio Conte and Jose Mourinho.
"I was just working and trying to do my best", Luiz added.
Sarri wants a keeper who is comfortable with the ball at his feet; Everton's Jordan Pickford is a target but the likelihood of the Toffees selling England's No 1 appears slim.
But while Manchester City gave the Catalan time to adjust in his first season in England, there is precious little time for Sarri.
Defender Axel Tuanzebe has already made way, re-signing for Aston Villa on a season-long loan, and Italian full-back Matteo Darmian could be exiting too as talks with Benfica reportedly continue. Some games I was playing well, and was taken off.