#1 Andreas Pereira
Pereira has already showcased what he's capable of during his time out on loan with Valencia, but he fails to replicate that great form at Old Trafford. The fact of the matter is simply that the Brazilian struggles to handle the pace of the Premier League matches, so when he does get a rare opportunity to prove himself, he falters and ultimately disappoints.
I imagine it's as frustrating for Jose Mourinho as it is for him, who obviously has tried to integrate the promising young star into the squad, without any such luck. United must be wary of making the same mistake they did with Pogba, though, where they let the Frenchman go too early, and bought him back several years later for a ridiculous amount.
Whilst his four appearances this season is an improvement on before, it's still a lot less than someone of his age and talent is deserving of.
Where might Andreas Pereira go?
Chelsea and Arsenal are very interested in the youngster, according to The Sun, and are prepared to bid against each other to secure his signature in January. A fee of around £10m is believed to be the starting price.