Fifteen years after hanging up his boxing gloves, Mike Tyson is about to put them on again.

Sort of.

"I. Am. Back." Tyson wrote on Twitter Thursday.

According to Yahoo Sports, the former heavyweight champion will be participating in an eight-round exhibition with former four-division champion Roy Jones Jr. on Sept. 12 at Dignity Health Sports Park in Carson, California. The pay-per-view event will be promoted by Triller.

Anyone expecting to see Tyson and Jones trying for knockouts, however, will be disappointed.

Despite the promotional video on Tyson's Twitter feed that features trash-talking from both fighters, Andy Foster, executive director of the California State Athletic Commission, told Yahoo Sports that the bout will be little more than a glorified sparring session.

"This isn't a situation where they're going out there to try to take each other's heads off," Foster said. "They're just going to be in there moving around the ring and letting fans see these legends."

The event is part of Tyson's new venture, the Legends Only League.

The 54-year-old Tyson (50-6, 44 KOs) hasn't fought competitively since 2005, when he failed to answer the bell for the seventh round against unheralded Kevin McBride in Washington, D.C. Since then, he's appeared in several "Hangover" movies while performing his one-man show, "Undisputed Truth," throughout the country. Most recently, he performed at Borgata Hotel Casino & Spa on March 6, one week before Atlantic City's casino properties closed due to the coronavirus pandemic.

Tyson has been training recently, as evidenced a series of videos that have appeared on social media. There was some talk of a potential bout against Evander Holyfield. Holyfield has already beaten Tyson twice, including a victory in the infamous "Bite Fight" in which Tyson bit off a portion of Holyfield's ear.

Holyfield (44-10-2, 29 KOs), 57, hasn't fought since 2011.

Jones (66-9, 47 KOs) has been more active, going 12-1 in 13 fights since 2011. In his last outing, on Feb. 8, 2018, he gained a 10-round decision over Scott Sigmon in Jones' hometown of Pensacola, Florida.

Tyson and Holyfield are both members of the Atlantic City Boxing Hall of Fame, having been inducted in 2017 and 2018, respectively. Jones was set to join them in the Hall this year, but the ACBHOF 2020 ceremonies were postponed until 2021 due to the Covid-19 pandemic.