The Chelsea goalkeeper Petr Cech faces up to a month on the sidelines after suffering a medial ligament injury in training.
The 29-year-old Czech Republic international, who played in Chelsea’s opening day 0-0 draw away at Stoke, will miss the Premier League matches against West Brom, Norwich, Sunderland and potentially Manchester United – with the match at Old Trafford taking place on Sunday 18 September.
The Chelsea manager André Villas-Boas said his staff were extremely concerned when they saw Cech falling awkwardly at the end of training on Wednesday.
Villas-Boas said: “It was the end of training, a normal training incident. He fell awkwardly with his weight on top of him. We expected much worse when we saw the incident.”