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The Spaniard sustained a minor muscular injury on Wednesday and has missed two days of training, but the Chelsea boss has not ruled out including him on the bench

Chelsea manager Jose Mourinho says striker Diego Costa is a "big doubt" for Saturday's clash with Everton after picking up an injury in training.

The Brazil-born Spaniard sustained a minor muscular problem and has been assessed by Chelsea's medical staff to determine the extent of the damage.

Mourinho insists he remains open-minded to the possibility of Costa featuring at Goodison Park but revealed his €37.5 million man has missed two days of training with the injury.

"He is a big doubt, let's see," the Chelsea boss told reporters. "Everyone else is fit.

"We are trying everything for him to play [on Saturday]. He didn't train for the last two days. Today is the last day.

"We have to try to see if the reaction is positive. If the reaction is positive, we'll take him and select him on the bench."

Costa has made an impressive start to his Chelsea career, scoring two important goals in his first two Premier League matches against Burnley and Leicester City.

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