The Frenchman looked to have sealed three points for United with a well-taken strike in the 73rd minute but substitute Ross Barkley found an equaliser at the death. OOPS Martial scores again!' the United defender tweeted after the win.
"I hope every referee does the same as Mike Dean, to give six minutes".
Mourinho said afterwards that he accepted Ianni's apology in the aftermath.
He said: "I'm not annoyed with anything". What happened with [Maurizio] Sarri's assistant, Sarri was the first one to come to me and say he will resolve it.
"The assistant has already come to me and apologised, I told him to forget it". "But I also made mistakes in football matches and will make more". After the final whistle he held up three fingers to signify the number of league titles he won across two spells at Stamford Bridge.
Questioned after the game, the Portuguese said it was in the past.
"But the reactions of the fans is up to them".
"I am disappointed with the last 30 minutes", he told the BBC.
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Harry and Meghan also made a quick stopover at Macarthur Girls High School in Parramatta, where they were met by children and well-wishers.
Sarri said: "I spoke with Jose afterwards and realised we were wrong".
"If I speak to a member of staff and am very hard [with him] I can not come here and tell everything because then I am not credible with the staff".
Marco Ianni, who is a second assistant to Maurizio Sarri, took great delight in seeing Ross Barkley snatch a 2-2 draw in stoppage-time.
Like in the come-from-behind 3-2 win over against Newcastle before the global break, it needed going behind to really spark United into action.
Mourinho's side attacked properly in the second half and reaped their rewards.
Mourinho kept his emotions in check for most of the afternoon as returned again to the club where enjoyed success still under pressure at Manchester United - but then it all boiled over in that super-charged finish.
Chelsea took the lead through Antonio Rudiger in the first half before a double from Anthony Martial got United in front.