He is now on break after playing for his country at the 2018 World Cup in Russian Federation, and Courtois will return to training on August 7 which is two days to the end of the January transfer window.
Willian had been on holiday following his worldwide duty with Brazil at the World Cup, but he was due to report back to Chelsea's camp on time with the Blues expecting him to play some part in Wednesday night's friendly against Arsenal.
Sarri wanted to sign former Roma rival Alisson but was beaten to the Brazilian by Liverpool, who spent £65m - a world-record splash on a keeper - to sign him last month.
Chelsea know they'll need to spend big following other goalkeeper moves in the transfer market this summer. "That is not a strengthen for Jack Butland or Kasper Schmeichel really".
"I am looking forward to playing in Wembley, it is my first time".
"But, I hope that Courtois will be our goalkeeper".
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Courtois is due back at Stamford Bridge after having a break following his impressive showings for Belgium at the World Cup.
Hazard has flirted with a move to Madrid in recent weeks having hailed the European champions a "special" club while hinting that he has a well-known "preferred destination".
The 26 year old has only a year left on his contract with Chelsea which is why the report further adds that the fee is only around €35 million, which if true is an absolute steal.
Chelsea will take on Manchester City on Sunday 5th in the Community Shield before the English Premier League officially starts the following weekend on Friday 10th.
That leaves Chelsea facing nine days to decide whether they are willing to write off £35million, by insisting he stays at Stamford Bridge this season.