Conor McGregor said he only fights "real fighters" after he apparently had a run-in with Machine Gun Kelly on the red carpet at the MTV Awards.

McGregor attended the ceremony at the Barclays Centre in New York with his partner Dee Devlin while the US musician Machine Gun Kelly arrived with his Hollywood actress girlfriend Megan Fox.

According to Reuters, security stepped in as tempers apparently began to flare and a member of McGregor's entourage tried to hold the fighter back as he threw a drink over the rapper.

Celebrity news website TMZ.com reported the incident occurred after Machine Gun Kelly, born Colson Baker, refused to pose for a photo with McGregor.

Speaking about the incident to Entertainment Tonight McGregor said "absolutely nothing" happened.

He continued: "I don't know. He showed up, and I don’t know. I don’t know the guy.

Conor McGregor on the red carpet at the MTV Awards in New York

"Nothing happened with me, I only fight real fighters, people that actually fight, you know what I mean.

He added: "I don’t even know the guy. I don’t know anything about him, except that he’s with Megan Fox."

Megan Fox and Machine Gun Kelly

Machine Gun Kelly was also asked about the alleged altercation but walked away without answering the question.

Both men later appeared during the VMAs ceremony.

Justin Bieber after accepting his MTV Award from Conor McGregor

McGregor, walking with a cane after suffering a serious leg injury in his latest fight in July, was on hand to award Justin Bieber his artist of the year prize.

Machine Gun Kelly was among the winners, taking home the prize for best alternative in recognition of his song My Ex’s Best Friend.

Megan Fox and Kourtney Kardashian

He and Transformers star Fox have been dating since last year.

She raised eyebrows at the VMAs by standing next to Kourtney Kardashian and introducing their respective boyfriends Machine Gun Kelly and Travis Barker to the stage as "our future baby daddies".

Here are the main winners from the MTV Awards 2021:

Video of the year – Lil Nas X (Montero (Call Me By Your Name))

Artist of the year – Justin Bieber

Best new artist – Olivia Rodrigo

Song of the year – Olivia Rodrigo (Drivers License)

Push performance artist of the year – Olivia Rodrigo

Best pop – Justin Bieber, Giveon, Daniel Caesar (Peaches)

Video for good – Billie Eilish (Your Power)

Best hip hop – Travis Scott featuring M.I.A. and Young Thug (Franchise)

Best collaboration – Doja Cat featuring SZA (Kiss Me More)

Best K pop – BTS (Butter)

Group of the year – BTS

Song of summer – BTS (Butter)

VMA global icon award – Foo Fighters

Best alternative – Machine Gun Kelly featuring Blackbear (My Ex's Best Friend)

Best R&B – Bruno Mars and Anderson .Paak (Leave The Door Open)

Best rock – John Mayer (Last Train Home)

Source: Press Association