Tyson Fury has challenged Francis Ngannou to "kick it up spicy in a cage" in a boxing fight refereed by Mike Tyson.
WBC world heavyweight champion Fury's team are trying to agree terms for an eagerly awaited unification bout with Oleksandr Usyk.
Fury revealed his return to the ring is "imminent" and a March date has provisionally been pencilled in for the Brit to do battle with Ukrainian Usyk.
Ngannou is set to pursue a boxing career after turning down a contract that would have made him the highest-paid heavyweight fighter in UFC history.
Fury and Ngannou have called each other out in the past and the 'Gypsy King' has laid down another challenge to the Cameroonian-French fighter.
He said in an interview with Seconds Out: "Francis Ngannou, I know you're out contract with the UFC.
"You want to earn some big boy money come see the 'Gypsy King' and let's do a big, big fight for the baddest M.F. on the planet.
"Let's kick it up spicy in a cage, four-ounce gloves, on the Queensberry, and let's have a badass referee like 'Iron' Mike Tyson. Did I just sell that to the world?"
He added: "If the contract doesn't get signed with Usyk next, the fight of the century in boxing, we'll do the Ngannou fight. Whether it's going to be in Las Vegas or Wembley, who will know. We'll know quite soon, I think."