Conor McGregor on Twitter: "The champ champ https://t.co/iprUKL0Ldx" / Twitter
ESPN MMA on Twitter: "Five years ago, Conor McGregor became the first double champion in UFC history. McGregor celebrated "Champ Champ" day by declaring himself next in line for a title shot
Conor McGregor warned it will be "very difficult" to become UFC champion again - Mirror Online
Conor McGregor | UFC
How has Conor McGregor become the undisputed, heavyweight champion of the social media world? - Irish Tech News
Conor McGregor | UFC
UFC champion Conor McGregor makes 3rd retirement announcement in 4 years - National | Globalnews.ca
Conor McGregor, UFC champion, has announced his retirement - CNN