3) Koke (Atletico Madrid to Barcelona)
With Barcelona facing a transfer ban for the next two transfer windows, it is thought that the Catalan giants are ready to step up their interest in some of their top targets, with Atletico Madrid starlet Koke among them. The talented Spanish playmaker is widely regarded as one of the best young midfielders in the world at the moment and was pivotal for Atletico in their superb title-winning campaign last season. A natural heir to Xavi, it is unsurprising that Barca are desperate to sign the 22-year-old and it could be that this move will be finalised before the end of the summer.