Goal understands Chelsea star Eden Hazard missed Friday's training with a back problem, putting him in doubt for Sunday's Premier League clash at Burnley.
Hazard missed Chelsea's Europa League clash with BATE on Thursday with the back injury, and could now miss an additional fixture.
The Belgian recieved treatment at Chelea's Cobham Training Centre on Friday, with Ethan Ampadu (knee) the only other injury issue for the Blues.
Hazard suffered the back injury in Saturday's 2-2 draw with Manchester United, playing the full match but grimacing in pain at times while holding his back.
The 27-year-old has been in stunning form for the Blues this season, netting eight goals in 11 appearances in all competition to lead the team in scoring.
Hazard has not yet been ruled out of Saturday's training session, the club's final preperation before Sunday's game.
The Blues are undefeated in the Premier League thus far, winning six and drawing three to sit two points behind co-leaders Liverpool and Man City.