Chelsea boss Jose Mourinho admits he regrets labelling Arsenal counterpart Arsene Wenger "a voyeur".
Mourinho claimed Wenger had become obsessed with his club.
He said: "If I could go back I would say 'hey, it's time to stop speaking about Chelsea, go to your own corner and speak about your own team.'
"But I wouldn't say what I said about him that hurt him. I didn't intend that. If I could go back and change it then I would."
The fall-out from the remark went on as Chelsea won 2-0 at Arsenal on Sunday.
Mourinho refused to shake Wenger's hand after Chelsea's victory because he felt he had been snubbed over a Christmas card he sent to the Highbury boss which contained an apology for the remark.
The Chelsea boss made his comments in an interview with FHM magazine.
Wenger has now accepted the apology, and said: "I appreciated the sentiment in the card. It was an apology, but I had no pre-conceived ideas or special resentment. Once I said it's over it's over.
"And if a card had come in or not come in, it would not change the way I feel about the situation.
"We got this card and we didn't make a fuss about it. We didn't blank anybody. I just went to the game and was ready to talk to anybody about anything. I'd never talk to a rival manager before the game.
"I find it ridiculous. This card has been treated like a CIA bomb. I couldn't understand Chelsea's reaction. I am sorry but I didn't want to show any discourtesy.
"There is a time to focus on your game and a time to focus on other games. When I meet a rival manager I sometimes do shake his hand before a game.
"I don't see any problem with that. But it depends on the position of the dug-outs and whether you come out at the same time."
And Wenger joked the infamous card could now raise money for charity.
He said: "I don't know where the card is. We could auction it - that's a good idea. I could give it to charity."