"We had decent dominance with the ball in the first half but that doesn't help if you give the ball away and they can counter".
"So, there's so many things that we need to think about".
Despite having much of the ball and countless opportunities to put themselves in front, the Red Devils never really troubled the Wanderers.
The side's captain, Conor Coady, looked back on the journey to reach the milestone of a win over one of the world's biggest clubs, saying: "We have some phenomenal players going forward".
"We got what we deserved".
"He's probably got his reasons why he left, so you've got to ask him", he added.
"We started too slowly and played into their hands".
The Welshman's future was cast into doubt under previous boss Santiago Solari, whilst Manchester United have always been linked with a move to bring the former Tottenham star back to the Premier League.
The players have looked lethargic of late and the suggestion is that they're exhausted from the stresses of the tactic as well as switching styles half way through the season.