In a clip shared on social media after United's defeat against Manchester City, Keane was seen arguing with one fan while he was signing autographs.
Explaining his side of the story for the first time, Keane told The Times: “So, I'm signing autographs, usual stuff, no manners. This guy stops me. He's got two jerseys.
“Dealers, they know when you'll be coming out after the TV. They spot you a mile away, they're waiting. Who goes to watch United against City with two replica Keane 16 shirts in a plastic bag?
“I'm signing these jerseys for the guy and I'm saying I don't want to be here all day, and this other guy is p****d so he calls me a p****. He doesn't see that I'm just having fun with the dealer.
“I wasn't going to stand there under the tunnel at Old Trafford and explain: 'Do you know what, you got the wrong end of the stick.'
“I just said, 'Look, you've had a few drinks,' and that was me being unbelievably mature, which is unlike me.
“The clip goes on social media. People say I was angry. That's not me angry. There's plenty levels beyond that, trust me. That was a normal chat with a punter who's annoying me. That was nothing. That kind of incident, I have the potential for 50 of them a day."
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