Chelsea boss Mauricio Pochettino is facing more frustration over Carney Chukwuemeka's absence.
The midfielder's injury recovery has been taking longer than expected and he has now suffered a fresh setback.
The London Evening Standard says Chukwuemeka is set to be out for at least another four weeks.
The youngster was forced off against West Ham on the second weekend of the season and was ruled out for around six weeks. As such, he was expected to be back next weekend.
But the knee injury appears worse than believed and Chukwuemeka's recovery period has been extended.