Step forward Nurmagomedov, the man from Dagestan who claimed the vacant 155lb strap by beating Al Iaquinta in April to extend his MMA record to 26-0.
The last time McGregor was in the Octagon, he scored a 2nd round knockout over lightweight champion Eddie Alvarez to become the first fighter to hold two world titles simultaneously.
McGregor was arrested, but was sentenced last month to perform five days of community service, avoiding jail time in a plea deal.
How will McGregor fare against the Nurmagomedov?
UFC chief Dana White is satisfied with how the legal system handled Conor McGregor's bus attack in NY, and he has no intention of adding any more discipline on top of that.
He is a formidable challenger for McGregor in a return from a 23-month break from MMA competition.
Donald Trump takes shot at LeBron James
But I think the president in charge now has given people - they don't care now, they throw it to your face", he said . "He made Lebron look smart, which isn't easy to do", the president tweeted of the Los Angeles Lakers player.
It's official, Conor McGregor will challenge Khabib Nurmagomedov for the UFC lightweight title in October.
Israel Adesanya didn't seem phased by Brunson's attempt of body shaming, and the up-and-comer has impressed UFC fans with his last three fights, which brought him victories over Rob Wilkinson, Marvin Vettori, and Brad Tavares.
McGregor has posted several photos on social media this week hyping his physical fitness in advance of the announcement, which neither fighter attended.
After Diaz vacated the presser, he took to Twitter to proclaim he's seemingly changed his mind about making his long-awaited return.
"I'm not fighting on that show", Diaz tweeted moments after stepping off stage, adding an expletive directed toward the UFC.
The bout, which will take place at UFC 229, is already being talked about as one of the fights of the year and promotional video for the fight has broken the internet in predictable style.