Khabib Nurmagomedov, right, defeated Conor McGregor by submission in their October 2018 UFC bout in Las Vegas.
Conor McGregor lands a punch on Dustin Poirier during their fight at UFC 257 in Abu Dhabi.
Dustin Poirier and Conor McGregor during their lightweight fight at UFC 257.
Dustin Poirier and Conor McGregor of Ireland at the UFC 257 press conference event inside Etihad Arena on UFC Fight Island on January 21, 2021 in Yas Island, Abu Dhabi.
Dustin Poirier reacts after his knockout victory over Conor McGregor at UFC 257. Reuters
Dustin Poirier and Conor McGregor face off during the UFC 257 weigh-in in Abu Dhabi in January.
Dustin Poirier and Conor McGregor face-off ahead of their fight at UFC 257 at Etihad Arena in Abu Dhabi.
Conor McGregor celebrates his win against Donald Cerrone at the T-Mobile Arena in Las Vegas in January 18, 2020.
Conor McGregor arrives for the 62nd Annual Grammy Awards in Los Angeles.
Conor McGregor moves in for a hit against Donald Cerrone during UFC 246 at T-Mobile Arena in Las Vegas.
Conor McGregor celebrates after defeating Donald "Cowboy" Cerrone during UFC 246 on January 18, 2020, in Las Vegas.
Conor McGregor during a press conference in Russia where he took the opportunity to reveal his comeback to the UFC.
Khabib Nurmagomedov, right, defeated Conor McGregor by submission in their October 2018 UFC bout in Las Vegas.
Conor McGregor lands a punch on Dustin Poirier during their fight at UFC 257 in Abu Dhabi.
Dustin Poirier and Conor McGregor during their lightweight fight at UFC 257.
Dustin Poirier and Conor McGregor of Ireland at the UFC 257 press conference event inside Etihad Arena on UFC Fight Island on January 21, 2021 in Yas Island, Abu Dhabi.
Dustin Poirier reacts after his knockout victory over Conor McGregor at UFC 257. Reuters
Dustin Poirier and Conor McGregor face off during the UFC 257 weigh-in in Abu Dhabi in January.
Dustin Poirier and Conor McGregor face-off ahead of their fight at UFC 257 at Etihad Arena in Abu Dhabi.
Conor McGregor celebrates his win against Donald Cerrone at the T-Mobile Arena in Las Vegas in January 18, 2020.
Conor McGregor arrives for the 62nd Annual Grammy Awards in Los Angeles.
Conor McGregor moves in for a hit against Donald Cerrone during UFC 246 at T-Mobile Arena in Las Vegas.
Conor McGregor celebrates after defeating Donald "Cowboy" Cerrone during UFC 246 on January 18, 2020, in Las Vegas.
Conor McGregor during a press conference in Russia where he took the opportunity to reveal his comeback to the UFC.
Khabib Nurmagomedov, right, defeated Conor McGregor by submission in their October 2018 UFC bout in Las Vegas.