Jose Mourinho is left reeling after Chelsea goalkeeper Thibaut Courtois injury blow
Chelsea goalkeeper Thibaut Courtois will be out of action for around three months after undergoing surgery on his right knee.
The 23-year-old Belgium goalkeeper tore the meniscus of his right knee in training and is likely to be out until December.
A statement from Chelsea read: "Thibaut Courtois underwent surgery yesterday (Thursday) on an avulsion of the posterior corner and medial part of the internal meniscus of his right knee.
"The successful surgery consisted of a reattachment of the meniscus by suturing."
The operation is understood to have taken place in Spain.
Courtois suffered the injury on Wednesday in circumstances boss Jose Mourinho was not familiar with, as it happened during a goalkeeper-specific session.
The Blues boss was braced for the bad news, indicating Courtois would be out for "quite a long time" prior to the exact prognosis being revealed.
The Barclays Premier League champions will first be without the Belgium goalkeeper for today's match at Everton, but Asmir Begovic will be required to deputise for some time to come.
"Courtois was injured in a training session with the goalkeepers and I cannot tell you much, but I can tell you that he needs surgery in his right knee," Mourinho said. "As a consequence of that he will be out for quite a long time. I cannot be at this moment more specific about the injury or the time he will be out."
It is another blow for the Blues, who have four points from their opening four games and sit eight points behind leaders Manchester City.