Chelsea assistant coach Marco Ianni could face the wrath of the FA as he has been charged for misconduct.
"I am not really happy, as I said before, after I have spoken with Jose I understood that we were on the wrong side of the situation".
He called it an "awful" result after one of United's better performances of a chequered season and when Manchester City later destroyed Burnley with four second-half goals, it meant Mourinho's troops, now ninth, are nine points behind their neighbours.
Speaking on American broadcaster NBC, the 41-year-old said: "Whoever that staff member is of Chelsea has just been an absolute disgrace".
Simon Johnson of the London Evening Standard reports that Ianni has been faced with a charge but Manchester United boss Jose Mourinho has escaped any form of punishment.
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He has played 310 times for the club, netting 97 goals in the process, while winning two Premier League titles and an FA Cup. The supporters will unveil the banner saying "Eden Hazard, we want you to stay".
"(Ianni) apologised to me, I accept his apologies, I think he deserves a second chance, I don't think he deserves to be sacked.
"The assistant has already come to me and apologized, I told him to forget it".
Of the incident involving Sarri's assistant, he added: "I'm not annoyed".
"Sarri was first to come to me and say he would resolve the problem internally with him", said Mourinho. What I did here today I will do in Madrid, in Milan, in Porto. After the back-to-back games against Juventus, United could soon find itself in third place.
Manchester United vs Chelsea, Premier League 2018: Paul Pogba Yells at Victor Lindelof for His Mistake! "However, we worked hard and this sort of match enabled us to show that we are a good team". End of story. With me, it's the end of the story in the minute he apologised to me.
"I will speak to him again (on Sunday)".