There are four Manchester United under-18 players who the club believes could be vital in years to come. It’s no secret that the Manchester United academy is the most important aspect of the club with their proud tradition continuing recently with Omari Forson becoming to 249th academy graduate to debut for the Red Devils. Recently, Marcus Rashford, Kobbie Mainoo and Alejandro Garnacho have been shining examples of this method working and it looks like there could well be another exciting crop coming through. United’s under-18s are top of the league with 12 wins from 12 and beat rivals Manches…