The Catalan club tried their level best as they had bid three times for the winger but they were rejected by the Stamford Bridge outfit.
The 29-year-old, who has also attracted interest from Manchester United this summer, is being relied upon by new boss Maurizio Sarri, with Eden Hazard likely to miss Sunday's game and the opening match of the season at Huddersfield.
Should the Brazil global depart, it could pave the way for Chelsea to pursue the signing of Borussia Dortmund winger Christian Pulisic.
Willianreportedly fails to return to training with Chelsea, four days after he was scheduled to report back to the club's Cobham training base.
"I'm back to England".
"I'm very happy living in London". "I'm very happy at Chelsea", the forward said.
Willian had fallen down the pecking order last season under former manager Antonio Conte, which had fueled speculation of a move away.
But it is thought Willian may be trying to put pressure on Chelsea for a new contract, with his current £125,000-a-week deal due to run out in two years.
It had been claimed in the British media that Real Madrid have made a bid of €110m to land both Courtois and Willian.
Chelsea may have been unsuccessful in their pursuit of Gonzalo Higuain, with the Italian striker instead choosing to join AC Milan as part of a swap deal with Leonardo Bonucci, but the Blues should still possess a potent attack next season.