CHELSEA have suffered a blow ahead of the new season after Christopher Nkunku hobbled off against Borussia Dortmund.
The £52million summer signing from RB Leipzig suffered an injury during the 1-1 draw with the German giants.
Nkunku, 25, came off after falling down following a challenge from defender Mats Hummels.
According to the Evening Standard, the France international will miss the start of the Premier League season.
However, the report claims that the Blues are hopeful that he will only be out for a matter of weeks rather than months.