Now, Courtois' agent, Christophe Henrotay, has had his say on the situation, urging Chelsea to be reasonable and consider the goalkeepers' reasons for wanting a move.
Chelsea have agreed a deal in principle with Real Madrid for Courtois' transfer, but the club have made it clear that they won't sanction the move unless they bring in a replacement.
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.
With that in mind, let's have a look at five keepers who could find themselves in between the sticks for Chelsea's opening game.
Willian arrived back late from his close season break and only joined his teammates at the club's training ground on Wednesday, four days before Chelsea face Manchester City in the Community Shield at Wembley Stadium.
Chelsea are reluctant to sell goalkeeper Courtois, who is in the final year of his contract, without first securing a replacement, but their top target Alisson was signed for £65 million by Liverpool last month.
The goalkeeper wants to return to Madrid to be closer to his family and experience a new challenge after four years as Chelsea's No.1. Loves talking all things wrestling including NJPW, ROH and WWE.
'It is understandable people might be upset because he wants to leave the club, we accept that. "I don't know in the future. It depends on the club, it depends especially on him, but I hope Courtois will be our goalkeeper".
"I am not moving, I am happy at Chelsea and living in London.I am very happy living in London", declared the forward.