Chelsea defender Wesley Fofana has had anterior cruciate ligament surgery, which will keep him out for several months.
The 22-year-old did not accompany the Blues on their pre-season tour of the United States in order to undergo “specialist medical assessments.”
The testing on Fofana’s knee “unfortunately confirmed that an operation would be required,” according to the London club.
Last summer, Chelsea paid £70 million to sign the France center-back from Leicester.
“Wesley will now begin his recovery and work with the club’s medical department at Cobham during his rehabilitation phase,” said a statement from Chelsea.