UFC President Dana White announced the dramatic change Wednesday night, three days before the mixed martial arts promotion's landmark show.

The Irish fighter was a no-show at a press conference Friday promoting the card, and UFC President Dana White said he would not meet Nate Diaz in a rematch on top of the July 9 card in Las Vegas.

UFC world champion Connor McGregor apparently announced his retirement from the mixed martial arts world in a short Twitter post Tuesday.