Conor McGregor warned it will be "very difficult" to become UFC champion again - Mirror Online
UFC featherweight champion Conor McGregor says his popularity will soon match Floyd Mayweather | MMA News | Sky Sports
Top Finishes: Conor McGregor - YouTube
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
UFC says Conor McGregor has vacated featherweight title
Morning Report: Conor McGregor celebrates 'World Champ Champ Day' on four-year anniversary of lightweight title win - MMA Fighting