Conor McGregor will not fight during UFC 200, UFC commissioner Dana White said on ESPN on Tuesday.

McGregor, 27, tweeted earlier Tuesday he would be retiring from the sport, though it’s unclear if that’s official. White said McGregor was pulled from UFC 200 for failing to appear at a press conference.

McGregor was scheduled to fight Nate Diaz at UFC 200. The Notorious One lost to Diaz at UFC 196 earlier this year.

White said UFC was working on creating a new main event for UFC 200.

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Been a wrestling fan for almost 30 years. I've seen Hulkamania, The New Generation, The NWO, the Attitude Era, and the PG Era, and I've enjoyed all of it in different ways. I still remember standing on the guardrail at ten years old and having it fall over in front of Razor Ramon. I was there live when The Undertaker abducted Stephanie McMahon, and I was there when The Rock surprised the entire TD Garden at a house show. Recently been getting into a lot of independent wrestling, especially in the Northeast. I follow WWE, NXT, TNA, ROH and NJPW, among others, but mainly only watch WWE/NXT religiously. I'll probably be more positive about WWE than you, and I'm OK with that.