Undefeated boxer Floyd Mayweather Jr. took to Instagram on Wednesday to announce he is coming out of retirement to fight UFC superstar Conor McGregor.

Rumors of the fight had been making rounds for a while. Mayweather has been vocal about his desire to exit retirement with a fight the mixed martial arts fighter.

McGregor when he was a guest on Conan O’Brien‘s talk show said “I would box him (Mayweather) if the opportunity arose.”

UFC president Dana White has said the fight will be at the boxing junior middleweight limit of 154 pounds, adding that the fighters will use 10-ounce gloves, and the fight will take place at T-Mobile Arena.

The fight will be broadcast on Showtime PPV.

Mayweather posted on a Instagram the promo photo with the caption “It’s official!” and McGregor replied on Twitter with a post poking fun at Mayweather with the caption, “THE FIGHT IS ON.”

https://www.instagram.com/p/BVVcvO8gIhc/

THE FIGHT IS ON. pic.twitter.com/KhW0u3jRft

— Conor McGregor (@TheNotoriousMMA) June 14, 2017

Photo Credit: Instagram | Floyd Mayweather