Last month, Cole Palmer was preparing to join Burnley on a season-long loan deal.Vincent Kompany had made a big push to bring his former Manchester City team-mate to Turf Moor and the framework of an agreement was in place; Pep Guardiola’s stance was that the deal could go through as soon as the Champions League holders had bought a new winger.By the time Jeremy Doku’s arrival from Rennes in a transfer worth €65million (£55.5m) was officially announced last week, however, the landscape had shifted significantly. A market had developed to buy rather than loan Palmer and Chelsea were at the head of it.Here is Sam Lee, Simon Johnson and Liam Twomey on how one of the more surprising deals of the summer window came together