United fans were not pleased with the 20-year-old on Saturday evening...
Indeed, as Louis van Gaal will remember too well, United were suffering from a serious injury crisis in defence back then and McNair's first senior appearances at Old Trafford did much to encourage supporters during a tough time.
A year later, though, and another injury crisis at United has ended up showing McNair in a different light. According to fans anyway.
After Manchester United's 2-1 loss to Bournemouth on Saturday evening, the 20-year-old was hardly receiving rave reviews. There were many at fault as United crashed to their second defeat in a row in all competitions, reacting to their Champions League exit in the worst possible fashion.
But McNair bore a significant brunt of the criticism, with plenty frustrated that the youngster was even picked by Van Gaal in the first place.
Where next for the out-of-form Old Trafford outfit? And can they still salvage a good season under Van Gaal? Here's how Manchester United fans reacted on Twitter to McNair's display against Bournemouth:
The fact McNair got anywhere near the squad never mind team speaks volumes.Should be flipping burgers for a living.This is pathetic #MUFC— Daniel Pettigrew (@sinesolenihil) December 12, 2015
McNair seems like a very average defender.. Mistake waiting to happen just like Evans. Mata needs to do much more at no 10 #MUFC— Konark Goel (@konark_goel) December 12, 2015
Imagine when you have this back four - Varela, Jackson, Blind, Paddy Mcnair, that's more like an academy club, Man Utd is gone #MUFC— K I N G (@iam_Kingcee) December 12, 2015