Pep Guardiola gave a damning assessment of himself as Manchester City manager following his side's 2-1 defeat to Manchester United.
City conceded goals on 88 and 90 minutes to the visitors at Old Trafford, with errors from Matheus Nunes and Ederson costing them dearly.
Bruno Fernandes scored from the penalty spot after Amad Diallo was brought down by Nunes, before Amad himself received a lofted pass from Lisandro Martinez, lifted the ball over Ederson and scored from a tight angle.
The defeat now means City have won just one of their last 11 matches in all competitions, and with it have arrived the first signs of pressure building on Guardiola.
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City now have the lowest points per game of any Premier League club since the beginning of November - and Guardiola has made an unprecedented assessment of his own managerial ability this season.
Speaking in his post-match press conference after the defeat to City's fierce rivals, Guardiola admitted: "All I have to do is keep working. I'm the boss, I'm the manager and I'm not good enough. It's as simple as that.
"I have to find a way to talk to them, to the training pitch, to the way we have to play, how to press, how to build up. I'm not good enough, I'm not doing well. That is the truth.
"People say, 'No, it's that player' and it's fixed, they don't play. But it's not that.
"Matheus [Nunes] put in an incredible effort to play left-back and played really, really good with or without [the ball]. But it happened, it's football and we move forward."
He continued: "I'm not good enough to find a way so that players feel peace in their bodies and in their mind to play. I'm not good.
"I knew that it would be a tough season in the beginning, I said it many times even when we were winning. But I didn't expect it to be hard like it is right now."
Topics: Manchester City, Pep Guardiola, Manchester United
Ryan Smart