Jose Mourinho declined to tell his postmatch news conference what he had said in an exchange of words with opposite number Antonio Conte at the final whistle of Manchester United's 4-0 thrashing at Stamford Bridge.
Conte urged the Chelsea fans to make more noise in the closing moments of the game, waving his arms to gee up the home crowd.
Mourinho then spoke to Conte immediately after the whistle, with Sky Italia reporting that he had told the Chelsea boss in Italian: "You don't wind up the crowd at 4-0. You do it at 1-0. It's humiliating."
But he told reporters: "You know me. I speak to Conte, I don't speak to you.
"You know that I am not the kind of guy to come here and share with you things that I don't want to share. It was me and Antonio. It stays with me and him unless he wants to share with you."
Told about the claims in the Sky Italia report, he said: "I have no comment."