Chelsea right-back Reece James may be set for surgery on his knee.
The right-wing-back suffered the blow against AC Milan earlier in the week during a Champions League group stage win.
James had been in outstanding form with the Blues, but may now miss the World Cup with England as well.
According to Football.London, the injury was not initially seen as too serious by Chelsea.
However, scans on Thursday showed the problem is worse than feared.
The 22-year-old now faces surgery and a long spell on the sidelines during a key part of his career.
