Cormier made his WWE debut as a special guest referee at the Fight Pit match at Extreme Rules

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 Rumor had it that there could be a WWE match between Cormier and former UFC Heavyweight Champion Brock Lesnar

 Daniel Cormier reveals about WWE match with Brock Lesnar

 Cormier said that "No, I've not heard anything about that,"

 "When something like this happens, and this is honestly very good for me because people start to talk,

 as you know, just because something makes sense doesn't mean that it's going to happen.  So no, there is not talk of me fighting Brock Lesnar."

 Cormier and Brock Lesnar appeared together in the Octagon at UFC 226

 When Cormier defeated Stipe Miocic to win the UFC Heavyweight Championship

 After winning, Cormier asked Brock Lesnar to enter the octagon

 To fulfill his wish, Brock Lesnar laughed and pushed him inside the octagon.

 It seemed that there might be a fight between them in the future but it never happened.