Reece James is reportedly a major doubt for Chelsea's clash with Arsenal on Saturday.
The defender has only managed one appearance this season and suffered a hamstring injury in August which has set him back.
Mauricio Pochettino had been hoping to re-introduce his captain to Premier League action soon.
However, he has been withdrawn from group training sessions and is training alone, with his return likely to be delayed even further, as per the Evening Standard.
A full-blown injury crisis has hit the Blues like a sucker punch this season and they sit 11th in the table.