4. Antoine Griezmann (Atletico Madrid)
Chelsea have already been heavily linked with the young striker but we have him at number four because he’s not really a natural replacement for Costa. But despite being more of a floating forward than an out and out striker, Griezmann scored 22 goals in his first campaign for Atletico and has 11 so far this term. At 24, he’s still learning, can develop in years to come and could possibly form an exciting, more flexible forward line at the club alongside Eden Hazard, Pedro and Willian. However, a release clause of £43 million could put any deal off in January and it remains unclear if the Frenchman would move to Stamford Bridge considering the club’s current situation.