The Blues' leading goalscorer could miss out on a third straight game after picking up another hamstring injury at the beginning of the month. The experienced Didier Drogba has deputised in his absence, but he now faces a fitness test of his own after suffering an ankle problem. And former Gunners midfielder Merson believes the outcome of the game depends on the fitness of Costa, with the only other striker Loic Remy also carrying a calf problem. If Diego Costa's not fit I can’t see any goals Paul Merson Jose Mourinho could even be forced to call on Blues youngster Dominic Solanke - which you can read more about here.  He said: "If Costa’s fit it’s a different...
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