Jose Mourinho apologised to Manchester United fans in the Stretford End after the humiliation at Chelsea.
Mourinho used his programme notes ahead of the EFL Cup clash against Manchester City to issue an apology for the weekend's result.
And then following the 1-0 win over their bitter rivals Mourinho gestured 4-0 with his hands before offering his hands in apology.
United went behind in the opening minute of their game at Stamford Bridge and never recovered from the setback, eventually shipping four goals
It was a nightmare return for Mourinho to his former club - and he has admitted his disappointment at the performance.
"As the leader of this squad I want to start by saying sorry to all the Manchester United fans around the world," he wrote.
"Sunday's 4-0 defeat at Chelsea was not a United result; it was a result which made us all extremely sorry for all our supporters and we all apologise for it."
Mourinho was also keen to thank the fans for their support during the Chelsea game.
Chelsea boss Antonio Conte was forced to rally the home support in the final 10 minutes of the game - despite being 4-0 up - because all he could hear was United's fans.
"Once again at Stamford Bridge our fans were sensational," Mourinho said.
"I cannot think of another set of supporters who would be singing for 90 minutes like that when their team was losing.
"They were a credit to the club and feel so sorry for them that the result could not match their performance."