United skipper Roy Keane says Republic of Ireland boss Mick McCarthy was right to send home from the Irish World Cup camp following his outburst.
"I don't regret what I said, but at the same time I agree that Mick had to send me home," admitted Keane.
"A player cannot speak to a manager like that and continue to work under him. Of that charge, I am guilty.
"I have never called Sir Alex Ferguson anything of the kind. We have had our arguments, of course, but I would not be a Manchester United player today if I had ever spoken to him like that."