Conor McGregor has apologised for his actions after entering the cage at Bellator 187 and confronting referee Marc Goddard.
McGregor was celebrating with his team-mate Charlie Ward following his win and leapt onto his friend, before entering into a dispute with the referee.
In a post on Instagram, the UFC star said: "I sincerely apologise for my behaviour at last weekend’s fight event in Dublin.
"While trying to support a loyal team-mate and friend, I let my emotions get the best of me and acted out of line.
"As a multiple weight UFC champion, executive producer, role model and public figure, I must hold myself to a higher standard."
McGregor said the reason he acted in such a manner was that in his opinion the referee "was making a horrendous decision in trying to pick an unconscious fighter up off the floor and force the fight to continue into the second round".
He added that "after witnessing my fighter in a fight where the worst happened and the opponent passed away from his injuries on the night, I thought the worst was about to happen again, and I lost it and over reacted. I am sorry to everyone."