Diego Costa, Atletico Madrid
If any transfer is the most likely to happen then it is this one, as Costa is reported to have already undergone a medical at Stamford Bridge ahead of a £32m move.
The 25-year-old was in brilliant form last term, scoring 37 goals in all competitions as Atleti won La Liga for the first time since 1996 and also reached their first ever Champions League final.
Source: ESPN.
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