Erik ten Hag said he was "surprised" by Manchester United's "lack of belief" after their comprehensive 6-3 loss to Manchester City at the Etihad Stadium.
Erling Haaland and Phil Foden both scored hat-tricks as City produced a dominant performance against their rivals on Sunday, though a second-half brace from Anthony Martial and a long-range strike from Antony allowed the Red Devils to salvage some pride.
As a result, Ten Hag joined United predecessors David Moyes, Louis van Gaal, Jose Mourinho, Ole Gunnar Solskjaer and Ralf Rangnick in losing his first Premier League match against City.
Asked what went wrong for United, who came into the game on the back of four successive league wins, Ten Hag told Sky Sports: "A lack of belief.
"I'm surprised, why we didn't bring it on the pitch. I've seen – since, obviously, four weeks ago – a different team, a different spirit, a different fight and a level of commitment.
"Today we didn't have commitment. From the first minute on, we were not on the front foot, we were not brave in possession"
Pushed on why he thought United fell short of their recent standards, the Dutchman added: "It's always difficult to find out.
"I have to talk with my players and find out. They know they got better [in recent games], I saw the performances against Arsenal and Liverpool.
"But if you don't fight, which they didn't, then you have a problem against a team like Man City."
Sunday's defeat represents just the fourth time United have conceded six goals in a Premier League match – two of which have come against City (also in a 6-1 loss in October 2011).
United's last league reverse was also a comprehensive one, but Ten Hag said the defeat at the Etihad was not comparable to last month's 4-0 thrashing at Brentford.
"I don't think you can compare it," he said. "It's definitely like it was against Brentford mentally, but it's different.
"Against Brentford we didn't run. Today, we wanted to run, but we didn't follow the principles or rules. Once again, it was a lack of belief."
While Ten Hag was pleased with Martial's contribution following his second-half introduction, he said it was impossible to take many positives from an "unacceptable" display.
"He had a really good pre-season and I'm happy for him that he scored goals, and also for Antony, but in this moment I cannot express for the outside world always positives," Ten Hag added.
"We are highly disappointed about this result and that has to be the tone for this Sunday. We have to accept that, but our performance is unacceptable.
"As a team, as individuals, we will criticise each other tomorrow, and then we have to learn the lessons and do better, starting next game.
"A team like City, they give you the status where you are at this moment. We did well against top teams like Liverpool and Arsenal. We were disciplined and followed the rules and the principles and we had the belief to play.
"We were on the front foot in defending and you can bring a good performance and a result.
"When you're not on the front foot and when you're not brave enough to play, you get the result like today."
Guardiola has 'no words' for hat-trick hero Haaland
Pep Guardiola was lost for words to describe Erling Haaland after his eighth Premier League hat-trick fired Manchester City to a 3-1 victory over West Ham.
Having scored a treble to help City claim a 4-1 win over Ipswich Town on matchday two, Haaland did likewise on Saturday to keep them perfect as they edged out the Hammers at the London Stadium.
Haaland's seven goals this season are the most any player has ever netted in the first three matches of a Premier League campaign, while only Sergio Aguero (12), Alan Shearer (11) and Robbie Fowler (nine) have ever helped themselves to more match balls in the competition.
Across English football's top four tiers, he is also the first player to score two hat-tricks in a team's first three games of a league season since Bradford City's Paul Jewell in 1994-95.
The Norwegian has now scored more than once in 26% of his Premier League matches (18/69, eight hat-tricks, 10 braces), leaving Guardiola in disbelief.
"There are no words for him," Guardiola told BBC Sport.
"All we can do is make him play better and better and give him as many balls as possible into the box. It's what we have to do. We are there and we added quality.
"This is a team. When you have to run backward, no one asks who has to do it. Everyone has to. When we see Erling doing that, it is fantastic."
Haaland himself, meanwhile, believes having an extended pre-season due to Norway missing out on Euro 2024 has helped him start the season in peak condition.
"I feel good. I feel energised. I had a long vacation and a long pre-season. I'm feeling good," Haaland told City's website.
"The years here have gone quick and it's been going like, 'bam bam bam', now I have a little bit of rest in my body and my feet. I feel really good now and I'm ready for more.
"I feel more refreshed and more energised. So when you do that you can practice on things you want to become better at in training. I feel good. I want to become better. I'm happy."
City sit top of the early-season table with nine points from nine available and saw last season's runners-up Arsenal slip up on Saturday, drawing 1-1 with Brighton and Hove Albion.
Haaland, though, feels it is too early to think about the title race, adding: "They [City's rivals] haven't slipped up yet. Three games, nine points. This is a great start.
"But let's not think too far ahead, because there’s potentially 70 games left this season. Let's breathe a bit and take it game by game."
Lopetegui rues missed opportunity as West Ham lose to Man City
West Ham manager Julen Lopetegui was not encouraged by the performance of his team despite losing 3-1 at home to Manchester City in their third league game.
“It is true that City is one of the best teams around the world for sure… but it is also true too that in the second half we have been very close to a draw,” he said speaking to BBC Match of the Day.
“I think we have played one very good second half. The start has been very good for us too.”
West Ham threatened for extended periods of the match and had chances to level the match at 2-1 down, with the best coming from Mohammed Kudus as he smashed a shot against the bar in the second half.
They also started the game brightly before going a goal down inside 10 minutes.
“In my mind we started very well, being aggressive,” said Lopetegui.
“We know in this plan normally they have initiative, it’s very difficult to not concede initiative then. That’s why you have to do a lot of very good things to overcome them.
“In the second half we had chances, I think we kept the ball much more, much more, and didn't concede a lot of chances."
But the hosts were ultimately undone by the brilliant finishing of Erling Haaland, who scored his second hat-trick in as many matches.
“He is one of the best players in the world, that's why he plays for Manchester City,” he said.
“You have to compete with these kind of players. City has the power and the quality to create chances.”
But ultimately, he was left frustrated at the sense of a missed opportunity and that his team were unable to earn themselves a draw that hadn’t seemed implausible during the match.
“Today I think the first goal was a pity for us but I’ve said it. I was happy with the performance think we were able to draw but again they damage us,” he said.
“Against this kind of team, if you make a mistake they don’t forgive. This is the difference they have… A little mistake they punish you, they punish us.
“We have to improve, to know to compete against this kind of team to be close to perfection.
“Don't make mistakes, be calm, defend well… we have quality players too.”
Bayer Leverkusen 2-3 Leipzig: Visitors fightback halts unbeaten streak for Alonso's side
Bayer Leverkusen suffered their first defeat in 36 Bundesliga matches, as Leipzig came from behind to stun Xabi Alonso's side 3-2 at BayArena.
Lois Openda struck twice for Marco Rose's, who recovered from 2-0 down to make it two wins from two and move to the summit of the table.
It looked like business as usual for the reigning Bundesliga champions when they scored twice in the last seven minutes of the first half through Jeremie Frimpong and Alejandro Grimaldo.
However, Leipzig replied deep into first-half stoppage time with Kevin Kampl reducing the deficit.
Openda then brought the visitors level in the 57th minute, before a stunning long-range strike completed the turnaround 10 minutes from time, condemning Leverkusen to their first league defeat in 15 months.
Data Debrief: Leverkusen's long streak comes to a shuddering halt
Leipzig became the first side to beat Leverkusen in a Bundesliga match since Bochum achieved the feat a staggering 462 days earlier.
The visitors have begun a Bundesliga season with two wins from two for only the second time, also doing so in 2019-20.
They are also now unbeaten in 13 league matches, their longest such streak since Rose took charge.
As for Leverkusen, their invincible streak is officially history, as is their 29-game unbeaten run on home soil.
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