#4 Lack of Pressing
Against a Barcelona team who are so good on the ball, United needed to work extra hard to win the ball back. The Catalans have ball playing men all around the pitch and these players are very good in tight places. They rarely misplace the ball and are always assured in their passing. In order to break such a set up, it is important to press high.
Solskjaer set his team out to put pressure on the away side and United did just that in the opening stages. Fred and McTominay were particularly impressive with their movement and closing down of opposition players. Everytime United pressed, Barcelona looked unsettled. Unfortunately, the home side could not keep up the momentum and the Catalans took advantage of their sloppiness in the first half.
In the second half though, United improved and pressed with intent. However, it was sporadic and thus failed to have the desired effect. With no pressure, Barcelona continued with their natural game and ran away with a win.