Anthony Martial admitted Manchester United players were "really frustrated" with their supine 6-3 defeat at City.
United trailed the Premier League champions 4-0 at half-time at the Etihad - the second time this season they were 4-0 down at the interval.
City were so rampant they went 6-1 up with 17 minutes left and their fans chanted "We want 10". Martial struck his first United goals in exactly a year to trim the losing margin to a flattering three goals.
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The 26-year-old has only made two substitute appearances this season due to hamstring and Achilles injuries and was grateful to return to the side ahead of away games against Omonia Nicosia and Everton this week.
"For sure, I would have preferred not to score and win this game but it's always good to come back on the grass and score," Martial told Canal+.
"We are really frustrated. That's not what we wanted to do but this result is the one and we are going to give everything to come back for the next game.
"We started the game really badly and then they were really efficient with the chances they had. It's really complicated but it's like that and we are going to do everything to be ready for the next match."
United travel to Cyprus for their third Europa League group stage game on Thursday and face Everton at Goodison Park on Sunday evening.
Martial has scored more goals against Everton (seven) than any other side.
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