Chelseas hierarchy are angry and embarrassed by the touchline fracas that resulted from coach Marco Ianni celebrating in front of Jose Mourinhos face on Saturday.
A thrilling 2-2 draw at Stamford Bridge between Chelsea and Manchester United was promptly overshadowed by ugly scenes off the pitch following Ross Barkleys late equaliser.
Ianni twice ran past Mourinho, celebrating wildly and taunting him, and the former Chelsea boss sprang out of the dugout in fury to confront the Italian, who quickly ran down the tunnel.
Mourinho had to be held back by a combination of stewards and his own players, before opposite number Maurizio Sarri helped to calm tempers and promised to reprimand Ianni.
And now Sky Sports report that Chelsea are furious with the coach, who spent two years under Sarri at Napoli, and will back whatever punishment he serves out.
The club believe his actions fell well below the standard expected of club staff, and are embarrassed by his decision to leave his seat and celebrate in front of the United bench.
Mourinho spoke with Ianni after the match in Sarris office and he apologised, though the Chelsea boss is still expected to discipline him.
Speaking about the incident afterwards, Mourinho told Sky Sports: I am not annoyed with anything. What happened was with Sarris assistant, and Sarri was the first one to come to me to say he would resolve the problem internally with me.
After that his assistant come to me in Sarris office and apologised to me. I immediately said if you really feel that way, and you want to apologise, of course I accept apologies, and to forget it because I made lots of mistakes in my career. So Im not going to kill you because of one.
More: Manchester United FC