Mason Greenwood has no future at Manchester United and his summer sale is among the most discussed stories at the club. In order to buy big this summer, Manchester United must first make some sales to increase the club budget and ensure safety from any PSR concerns. Multiple names have therefore been linked with an exit including Aaron Wan-Bissaka, Casemiro, Jadon Sancho, Mason Greenwood and Victor Lindelof. Some heavy hitters could therefore be on their way out of Old Trafford this summer in order for Ineos to strengthen. But for Greenwood, the sale is looking most advanced, is most important…