'Injustice': Lisandro Martinez reacts to 'unacceptable' mistake as Manchester United beaten in derby

Martinez was the Man United player involved in the controversy as the ball missed him in the box, leaving Haaland free at the back post for a tap-in.

Replays showed the Argentine’s line of vision was impacted by Enzo Fernandez - in an offside position - diving for the ball and the central defender has said the decision to allow the goal is “unacceptable”.

"I think [Fernandez] was offside. What I can’t understand is the rules,” Martinez told Sky Sports.

"He was there! I went to him because he was in front of me. That’s why Haaland was free at the back.

Controversy in the Manchester derby

Sky Sports

"I want to be calm but it is so hard. Every season the officials come to our club and spend an hour explaining the rules and they look so confident with that.

"Then after, five or six people (officials) doing this kind of mistake in the Premier League is unacceptable.