CONOR McGregor allegedly threw a punch at a man after a bust up at a Dublin pub at the weekend.

The Notorious, 30, was back in town to appear at an amateur MMA event on Friday but reportedly became embroiled in an altercation at the Marble Arch Pub in Drimnagh on Saturday.

1 McGregor was spotted outside the Marble Arch pub on Saturday

The Irish Mirror reports that McGregor threw a punch after after he became involved in a verbal exchange with a punter at the south side boozer.

The Mirror claims that the former double champ, who recently announced his retirement from the UFC before hinting he might return to octagon, was showing off in the boozer.

A bystander took issue with the Crumlin native's antics before mocking him over his much-publicised loss to Khabib Nurmagomedov last year.

'THE RUSSIAN BATTERED YOU'

The Irish Mirror says an individual was heard goading McGregor, saying: "The Russian battered you."

When contacted by the Irish Sun, Gardai said: "Gardaí are investigating an incident at a pub in Drimnagh on the 6th April 2019."

The Irish Sun has contacted Conor McGregor's representatives for comment.

The Notorious was back in town at the weekend as he appeared alongside long-time coach John Kavanagh at a Dublin grassroots MMA event.

McGregor was pictured on social media alongside Kavanagh on Friday before being snapped outside the Marble Arch pub in the same clothes he had on the night before, as exclusively revealed by the Irish Sun.

The fresh reports come following Mac's recent run-ins with the law in the US.

CHARGES REDUCED

McGregor, 30, was charged with strong-arm robbery and misdemeanour criminal mischief following an altercation with Ahmed Abdirzak outside the Fontainebleau Hotel in Miami Beach on March 11.

The former double champ was accused of slapping a phone out of Abdirzak’s hand and stamping repeatedly on the phone which was thought to be worth $1,000.

The price of the phone is relevant as it bumped-up the charge against the UFC bad boy.

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However, court documents show that the Crumlin brawler’s charges have been reduced ahead of the court date to a third-degree felony of sudden snatching.

The move by Florida prosecutors to reduce the charges decreases the Dubliner’s potential prison sentence from 20 years to six.

The case is due before a Miami court next week, but the MMA star is not compelled to appear.