Chelsea star Diego Costa has been rated as a doubt ahead of the Blues' blockbuster encounter against rivals Arsenal this Sunday.

Costa picked up an injury during Chelsea's 3-3 draw against Everton on Saturday and following scans, it has been revealed that the striker is suffering from a bruised tibia.

While Chelsea will be relieved that Costa did not suffer a fracture, which had been suspected at the time, they could be without the 27-year-old for the encounter against London rivals Arsenal.

Costa has scored five goals in his past five outings for the Blues meaning his absence could be costly for Guus Hiddink's men.