Last weekend, McGregor made his long-awaited return to the cage at UFC 329, where he rematched Max Holloway in the main event. Unfortunately, the bout ended before it ever really got started as McGregor injured his knee in the opening moments while throwing a jumping switch kick. And now we know exactly what he did to it.

Speaking with reporters following UFC Oklahoma City, UFC CEO Dana White revealed that, as many speculated, McGregor tore his ACL.

“ACL,†White said when asked about the injury. “His knee is f*cked up.â€

That is a tough blow for McGregor, who spent the past five years out of action, much of that time due to his catastrophic leg break against Dustin Poirier. McGregor previously mentioned he would need surgery on the knee, but a torn ACL means “Notorious†is likely looking at another nine months to a year on the shelf.

Before UFC 329, McGregor mentioned that the UFC was targeting an April date for McGregor's final fight on his current UFC contract; however, given this news, the earliest McGregor can fight is probably next summer. And for White, it's so far out that any speculation about when or where is useless.

“He's having knee surgery. That's it,†White said. “The Conor McGregor discussion isn't even worth talking about. He's got to have knee surgery. He's going to have to go through physical therapy. It's all going to take time. And then when the doctor says you can start hardcore training again, then we start talking about Conor McGregor again.â€

On Saturday, Muhammad competed at RAF 11 in Milwaukee, defeating Ben Askren via points in Askren's retirement wrestling match. After the match, Muhammad called for a bout with Colby Covington, who would go on to defeat Arman Tsarukyan for the inaugural RAF crossover championship. And at the post-event press conference, Muhammad and Covington nearly came to blows.

Muhammad and Covington have beefed for years, dating back to their time in the UFC, though the two never fought. But once they were on the same podium for the press conference, things quickly spiraled.

“He went against a lightweight!†Muhammad said about Covington. “Tell him to go against a welterweight, somebody his size! Cleveland's right around the corner! Let's go!â€

“Bro, you barely beat the dead guy!†Covington responded. “This guy can only score on dead guy and gargoyles. That's it. You're a bum, bro. Keep talking, you're a nobody. You got teched by a nobody.â€

After this exchange, RAF announced that Covington and Muhammad will face off in the co-main event of RAF 12 in Cleveland next month, prompting both men to up their trash talk.

“It will be the easiest match I get in RAF,†Covington said. “I can't believe they're going to give me a free win like that. Super exciting for me. Easy money. No one's beating me for this belt.â€

“Let's see if he shows up in August,†Muhammad replied.

Their bickering continued, with each man talking over the other until things finally escalated to the point that Covington threatened to smack Muhammad, prompting Muhammad to stand up and charge at Covington. RAF officials got in the way before Muhammad could get to him, leaving the former UFC welterweight champion with few options but to throw a weak kick at Covington, which fell short. Nevertheless, Covington then charged at Muhammad, resulting in a total mess as team members and security all jumped into a pile.

Eventually, cooler heads prevailed, and both fighters were escorted out.

Check out the whole sordid scene below, or the full press conference video above.