Jose Mourinho felt Manchester United were denied a clear penalty in their 2-1 defeat to Manchester City and claimed the decision was the "crucial mistake" in Sunday's derby.
The Premier League leaders secured a 14th win in a row - a record for a single season in the English top flight - and an 11-point lead at the Premier League summit thanks to goals from David Silva and Nicolas Otamendi either side of a Marcus Rashford strike.
City dominated possession at Old Trafford and looked unlikely to allow United back into the game for a second time after Otamendi's winner, although there was a controversial incident with 11 minutes left when Ander Herrera was booked for diving after being clipped by the Argentine defender in the penalty area.
The United boss told Sky Sports: "Clear penalty. I'm sorry for us, for Michael, I think he had a good game but it's a clear penalty. Don't you agree?
"The referee made a mistake, which can happen. Last season, we had a similar situation against Manchester City, who were winning 2-1 and Mr [Mark] Clattenburg didn't see the penalty of Bravo on Rooney.
"I'm sorry for Michael Oliver because he had a good performance.
"He is a human being, he tried his best, he was very committed to have a good match, which I think he had. But he made one mistake and it was the crucial mistake for the result of the match."
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