Pep Guardiola was furious with the ball used for Manchester City's Carabao Cup win over Wolves.
The Premier League leaders were forced to penalties after no goals were scored in 120 minutes of play.
And Guardiola has gone on a tirade following the win, blaming the ball for his side's inability to score.
"It is not acceptable, the ball was unacceptable for a high-level competition," Guardiola said. "It is too light, it moves all over the place, it is not a good ball.
"It is impossible to score with a ball like that and I can say that because we won, I'm not making excuses.
"All of my players said: 'What is that?' I'm sorry Carabao Cup is not a serious ball for a serious competition. It's [for] marketing, money, OK but it's not acceptable – [it has] no weight, nothing."