Fernandes scored the first goal of the game with a tap-in to set the tone for what would be a routine win.
His second, which came on the counter-attack, was a beautifully-taken goal after some nice build-up play.
After his two goals, Sociedad were forced to go all-out to try and salvage something, leaving themselves open at the back for Marcus Rashford to waltz through and slot home for a third.
With Sociedad desperate to get something from the match they again threw men forward and allowed for James to sprint down on goal and fire in a fourth.
With that being said, it would be tough to argue that United need any more help in the middle of the park.
