Hazard will miss at least Chelsea's next two Premier League games against West Ham and Aston Villa

As it stands, Costa is already out of this Saturday’s home clash with West Ham, but could also miss the following weekend’s trip to Aston Villa.

He has already been banned once this season, for raising his hands to Arsenal defender Laurent Koscielny in September, and has been booked 11 times.

Even worse news though for a Chelsea team struggling for goals and quality is that Belgian star Hazard, who has had an injury plagued campaign, could now be sidelined for as long as four weeks with a recurring hip problem, the club fear.

Hazard, who has scored only two goals all season, has been struggling with the injury for some time and has been worried that it has not gone away.

The 25-year-old has been heavily criticized for his performances, but sources close to the player say he has been deeply concerned about the first serious injury of his career.