The manager believed that the goal should not have stood - and would have been ruled out in a game that utilised the VAR system - due to an offside claim. United's misery was then compounded by a Victor Lindelof own goal just before the interval and a second-half strike from Marko Arnautovic, which Mourinho felt should have been chalked off for a foul from Pablo Zabaleta on Marcus Rashford during the build-up.
WE NEEDED TO START WELL
“We were a team that comes with that mental fragility of a bad result [the Derby match].