UFC officials confirmed the bout to ESPN.com, following an initial report by Yahoo! Sports. The pay-per-view event is scheduled to take place at MGM Grand Garden Arena.
The UFC had been in discussions to take UFC 194 to AT&T Stadium on Dec. 5 in Arlington, Texas, but ultimately landed in Las Vegas. A previously reserved concert at MGM Grand forced the promotion to postpone the event one week.
Aldo (25-1) was originally scheduled to defend his title against McGregor at UFC 189 on July 11. Aldo suffered a rib injury while training for the fight, however, and was eventually replaced on the card by Chad Mendes.
McGregor (18-2) remained on the card and claimed the interim 145-pound title, knocking out Mendes (17-3) with punches at 4:57 of the second round. McGregor is 6-0 in the UFC with five wins by knockout.
Had UFC 194 landed in the Dallas Cowboys' 100,000-plus capacity stadium, the UFC had considered booking female bantamweight champion Ronda Rousey to the co-main event.
White told Yahoo! Sports that will no longer be the case. He went on to confirm Rousey (12-0) will fight Miesha Tate (17-5), whom she has already beaten twice, at a later date.
"That fight isn't going to be on the [Aldo-McGregor] card, for sure," White told Yahoo! Sports. "If we were going to go to Dallas Cowboys Stadium, that's another story, but the MGM really wanted the [Aldo-McGregor] fight, and they made a huge effort for it and they got it. And it works out better for us to be in Las Vegas."
In regard to a potential fight between Rousey and Invicta FC featherweight champion Cris "Cyborg" Justino, White has reiterated the UFC's stance that Justino must prove she can make the 135-pound weight limit before the fight is booked.