There's fresh Chelsea concern that Christopher Nkunku won't be seen in action until DECEMBER.

A knee injury suffered in Chicago against Borussia Dortmund last week will now require surgery, says BBC Sport.

And the prognosis has blown out from a two-month recovery period to FIVE MONTHS.

Nkunku impressed during Chelsea's preseason, having arrived in the summer from RB Leipzig.

The Blues kick off their Premier League campaign this weekend against Liverpool.