At home, Man City led Man United from the first half. But from the 88th to the 90th minute, they lost 2 goals in a row, including a regrettable mistake by Matheus Nunes. This was Man City's 8th defeat in the last 11 matches, leaving the team still in crisis.
After the match, City midfielder Phil Foden accused his team of "defending like a youth team", while Bernardo Silva said his side "played like an under-15 team" at the Etihad.
The derby defeat left Man City in fifth place in the Premier League, nine points behind Liverpool and having played one game more. Guardiola said he was not good enough to manage the club at the moment, despite having signed a two-year contract extension just a month ago.
"I'm the owner, the manager of the team and I'm not good enough. I have to find a solution, it's that simple. I'm not doing well, that's the truth. That's how it is. What can I say? We can't blame this player or that player, that's not it. It's a difficult season.
"We didn't play at our best. We're not the best team and we're having a bit of trouble. It's the eighth defeat in 11 games, which is not normal. Man City are not good. The situation is getting worse. I have to find a solution, but I haven't found it yet," Guardiola said after the match.
Man City's current form has made this their worst run of form since 2003, when they won just once in 18 games. Having conceded two goals, from a Bruno Fernandes penalty and then an Amad Diallo dive, many Man City players have even expressed doubts about their own teammates.
“We defended like a young team. That’s the reality of the moment. I don’t know what happened, but when we went into defence, Man United scored two goals,” Foden said after the match.
Meanwhile, midfielder Bernardo Silva believes Man City deserved to lose. He told Sky Sports: “This result is deserved after what happened. At this level, losing 1-2 games can be unlucky, but when it happens in 10 games, we can’t blame it on luck.
Not just one game, but many recent games, we have to look back at ourselves. In this game, in the last moment, we played like U15 players."
Guardiola and Man City's next match is in the Premier League, where they will travel to Aston Villa.