Press Association Sport understands the 26-year-old was absent from the Blues' Cobham training base despite being due to make his return from a summer break.
Chelsea and Real Madrid, both the European heavyweights were keen to bring Brazilian goalkeeping cameo Alisson Becker only before Liverpool landed the goalkeeper in a deal rising to the extent of around £67 million which saw him become the world expensive player of his position.
"Chelsea wants for the best players to stay", said Luiz.
But the former England worldwide has come in from the cold under Sarri and played a full 90 minutes in the 2-0 loss to Manchester City in the Community Shield on Sunday.
"The only cub who made an offer for me was Barcelona", revealed the player.
While the transfer deadline is set at 5pm on Thursday for English clubs, Chelsea can sell Courtois at any point up to the end of the month when the market closes for their counterparts in Spain.
It was a heart-breaking blow for the talented goalkeeper, who looked a cert for Roy Hodgson's England squad for Euro 2016, with many even tipping him to wrestle the Three Lions starting spot from Joe Hart.
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Speaking on Friday, new Blues manager Maurizio Sarri said he was unsure whether Courtois would stay.
In fact, on Monday afternoon a SPAR supermarket in Tenerife claim they have found the AWOL Courtois in their shop as the new season approaches.
Aguero edged past Eric Brook's 78-year record as City's all-time top scorer when he scored the third in the 4-2 win over Napoli last November to top Brook's 177 total.
Richarlison from Watford to Everton.
The Toffees are said to have reached a £28.5million, five-year deal for the Colombia global, who is set to be the second Barca player to switch from the Nou Camp to Goodison Park this summer after Lucas Digne.
Bournemouth will be hoping to wrap up the signing of Colombian defensive midfielder Jefferson Lerma for a club-record fee.
The Italy worldwide, who was born in Brazil, was transferred to the London club from Napoli in a deal worth almost £60million this summer. Do Chelsea need to get rid and replace the Belgian before it's too late?