5 strikers Chelsea could sign after Diego Costa injury, including Arsenal target & South American goal machine

2) Jackson Martinez (Porto)

One of the deadliest finishers in the world at the moment, it is a surprise once again that Porto striker Jackson Martinez has not been snapped up by a bigger club this summer. The 27-year-old Colombian has been linked with a whole host of European giants in the last couple of years, with Chelsea thought to be among them until they moved for Costa instead. Still, Martinez could clearly fulfill a role at Stamford Bridge if he moved now, and he has reportedly had his release clause lowered to around £28m.