Diego Costa injured against Stoke.
The Spain striker was withdrawn before half-time in the Blues match in the Potteries, adding to the pressure on the Stamford Bridge boss.
Chelsea striker Diego Costa was forced off with injury in the first-half of Chelsea's League Cup fixture with Stoke Cityon Tuesday night, adding to the problems of beleaguered boss Jose Mourinho.
The Spain international had started brightly, testing the home side's defence, but went down holding the side of his chest in the opening thirty minutes.
After lengthy treatment, Costa opted to continue before being forced off as he again broke down minutes later.
The Chelsea striker left the field with a pained expression, continuing to hold onto the area around his ribs, as Loic Remy was summoned from the bench.
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