Aaron Wan-Bissaka has become the most expensive defender in Manchester United’s history after completing a deal worth up to £50 million from Crystal Palace on Saturday. Aaron Wan-Bissaka has joined Manchester United from Crystal Palace for a fee rising to £50 million. (Photo: AFP/Ben Stansall) Despite the huge fee, the 21-year-old made just 46 senior appearances for the Eagles and has yet to be called up by England. AFP Sport looks at why have United splashed such a huge fee to kick off a major rebuild at Old Trafford after missing out on Champions League qualification last season. CONVERTED WINGER Wan-Bissaka grew up in the surroundings of Palace’s Selhurst Park before joining the club’s academy at the age of 11. However, having started out as a winger, he did not stand out. Indeed, his talent may have gone unspotted had he not been pitted against Palace’s star player Wilfried Zaha one day in training when he impressed coaches with his ability to nullify the Ivorian. “I can remember watching the session and thinking afterwards, ‘He did all right at right-back,’” said Kevin Keen, who was Palace’s first-team coach at the time. “The following week I took Aaron again, and he…