Rollins and Riddle share a bitter rivalry that will see the pair face off in a Fight Pit match at the WWE Extreme Rules event this Saturday (October 8).
And Cormier, one of only four doubleweight champions in UFC history, will make his first WWE appearance when he officiates a fight between fellow Americans.
After announcing his participation in Extreme Rules, the former heavyweight and light heavyweight champion wrote on Instagram: “I will be fair. I’ll be honest. I will be impartial. And I won’t take nobody’s shit.
“I will be there for a reason. The Law has been called, and I will apply it with every part of myself to the fullest.”
Riddle previously competed in the UFC between 2008 and 2013, fighting as a welterweight and posting a 7-3 record, and also saw two fights go to a no contest.
Meanwhile, 43-year-old Cormier retired from mixed martial arts in August 2020 after losing his second straight loss to Stipe Miocic.
Prior to these losses, Cormier knocked out Miocic to win the UFC heavyweight title and became only the fourth UFC fighter to hold two titles at once, following in the footsteps of Conor McGregor, Amanda Nunes and Henry Cejudo.
“DC” was the light heavyweight champion at the time he added the heavyweight title to his collection, though he later retired the light heavyweight belt. The former Olympic wrestler then lost the heavyweight gold to Miocic in a doubles rematch and failed to win it back in their trilogy, the last fight of Cormier’s professional MMA career.