McGregor, who was stripped of his UFC lightweight title on Thursday, gatecrashed the UFC 223 media day, sparking chaotic scenes.
The Irishman has been charged with three counts of assault and one count of criminal mischief for his involment in the backstage disturbance at the Barclays Center in Brooklyn.
Videos appeared on social media showing McGregor and his entourage using a metal barricade and other objects to smash windows on a bus filled with fighters leaving the event.
Fighter Michael Chiesa suffered facial injuries in the attack and new footage on the UFC Vlog has shown the extent of his cut.
The vlog also shows Reed Harris, UFC VP of Athlete Development informing UFC chief Dana White of the incident.
"Conor McGregor's team just attacked our bus. They threw a chair through a window," he said.
McGregor has since been released on bail but he is due to return to Nee York on June 14 for his next hearing.
McGregor, who made a reported $140million from a boxing match with Floyd Mayweather last August, has not fought in a UFC bout since the win over Eddie Alvarez in November 2016.
But UFC chief White has since also revealed there had been talks above McGregor possibly returning to the Octagon in September.
“We had talked about him fighting in September,” White said.
However, White is now unsure of whether McGregor could still fight in September.
“I don’t know,” he replied when asked.
“You can’t ask me anything about Conor. I don’t know anything about Conor.
“I haven’t thought about it. There’s nothing to think about this week except for this event.”