Chelsea defender Wesley Fofana faces several months on the sidelines after undergoing surgery on an anterior cruciate ligament surgery.
The France centre-back, 22, joined Chelsea from Leicester for £70m last summer.
Fofana was out more than four months after suffering a knee injury against AC Milan in the Champions League.
And during his time at Leicester he suffered a broken leg in a pre-season friendly in 2021.
He now faces another prolonged spell out of action – a major blow for the player and new boss Mauricio Pochettino.