0948 GMT September 18, 2019
United ended a run of four successive Manchester derby defeats with an impressive 4-2 victory against its local rivals, eurosport.com reported.
Ashley Young cancelled out Sergio Aguero’s opener before United ran riot, with Marouane Fellaini, Juan Mata and Chris Smalling finding the net before Aguero’s late second.
The win moved United four points clear of its local rival, which is now in a scrap for Champions League qualification after being joint-top on New Year’s Day.
However United manager Van Gaal has revealed that his decision to make all three of his substitutions before Michael Carrick went down injured late on in the match represented a sizable blunder.
“At the end, Michael Carrick needed to be changed but I could not substitute him,” he said to MUTV.
“He was very wise to step out of the game with my permission. I hope he is not injured.”
He added, “Of course, the result [at the time] is fantastic, 4-1, but then I had to bring Carrick off, it was a little bit stupid of me.
“I wanted to give all of my players minutes because they have been working so hard. Wayne [Rooney] had to play as a holding midfielder, and it was difficult. The second half was much better than the first and I think that, until the moment Michael went off, we were fantastic.”