Manchester United’s 25-player squad for the Europa League features no Kobbie Mainoo or Alejandro Garnacho, but there is good reason for both omissions.

Even at 19 and 20 years of age respectively, Mainoo and Garnacho have become two of the most important players in United’s squad. That became crystal clear when both developing talents put in star performances in the victorious FA Cup final against Manchester City in May.

They remain invaluable, but their absence from the Europa League squad…