The MMA figther said seeing it back was like a "dagger into my heart."
Appearing on ESPN on Thursday, Dubliner McGregor shared his side of the story.
He immediately admitted that he was in the wrong and is ready to take accountability for his actions.
"In reality it doesn't matter what happened there, I was in the wrong" he said.
The video of McGregor allegedly punching a man in a Drimnagh pub circulated online last week.
It is believed the incident happened back in April.
Gardaí have confirmed they're still investigating an incident at a pub in Drimnagh.
“I was in the wrong. I must come here before you and take accountability and take responsibility… I’m just here to own up to [my mistake] and move on.”@TheNotoriousMMA breaks his silence in exclusive interview with @arielhelwanipic.twitter.com/pWZchLKZYs
— SportsCenter (@SportsCenter) August 22, 2019
It was the head of UFC Dana White who originally confirmed it was Conor in the footage.
Dana White said "the only reason we're talking about this is because it's Conor".
The UFC President "when you're a high profile guy and a professional guy, you can't do it".
Dana White also claimed "a lot" of "guys get punched in the face in a pub in Ireland every day".