Ruud van Nistelrooy’s interim spell may be ending but, with PAOK to come on Thursday night, the Manchester United legend could yet look to lay down a legacy. If a certain teenage midfielder one day blossoms into a first-team regular at Manchester United – following in the footsteps of Kobbie Mainoo and Alejandro Garnacho – then the history books will always show that it was Ruud van Nistelrooy who handed him his first senior outing in that famous red shirt. Well, that’s if Jayce Fitzgerald features against the Greek champions at Old Trafford, of course. But he is now free to do just that, with…