Why Chelsea have confirmed double injury blow and left out crucial Reece James update
Chalobah also picked up an injury during pre-season and has been working round the clock to return despite growing rumours that he might be surplus to requirement at the club.
Chelsea confirmed both players were in doubt about this weekend's game in a short statement: "Defender Trevoh Chalobah and midfielder Carney Chukwuemeka have both suffered recent setbacks in their bid to return from respective injuries sustained earlier this season.
Surprisingly Chelsea have not commented on reports that captain Reece James who has been sidelined since the game against Liverpool is a doubt for this weekend's Londonderby. Club sources say they are not sure if the player could return at this point to play a part thus the reason for their silence on the skipper.
James missed a total of 24 league games last season and was left of the England World Cup due to a knee injury. He also missed the end of last campaign with a hamstring issue.