McGregor, who came out of retirement for a third time to face Poirier, was beaten in the second round via technical knockout.
Conor McGregor has had legal problems in the past. In 2019, he was fined by a Dublin court for punching a man in a pub.
The Irishman in a cryptic tweet accepted a fight with UFC superstar Khamzat Chimaev after responding to his call-out on social media.
Former UFC featherweight and lightweight champion McGregor had last month announced that he is retiring from fighting.
This is the first time that McGregor has been linked to joining WWE since the first rumour emerged in 2017 and then again in 2019
Floyd Mayweather took a dig at Conor McGregor after the fighter announced his decision to retire last week.
Conor McGregor took to Twitter to announce his retirement from fighting.
McGregor was responding to the praise he got from boxing great Mike Tyson for his performance in his fight against Mayweather in 2017.
Conor McGregor (22-4) floored Cerrone (36-14) only 20 seconds into the bout with a perfectly placed left kick to the head.
In a post on his Twitter account, the former UFC featherweight and lightweight champion said: "I've decided to retire from the sport formally known as 'Mixed Martial Art' today."
Conor McGregor, who's from Ireland, is the former UFC featherweight and lightweight champion and one of the biggest draws in MMA.