Manchester United are no longer able to scour Europe for promising teenage prospects under 18, as was the case prior to Brexit. This previous policy allowed the club to swoop for 16-year-old wonderkid Alejandro Garnacho, who has since gone onto become a first team regular, FA Cup winner, and Argentina international. Another player the club signed 12 months earlier arrived with even higher hopes, Hannibal Mejbri was seen as the jewel of United’s foreign recruitment policy. Hannibal has now completed his move to Burnley, five years later, for a fee rising from £5.4 million to £9.4 million, with …