Deontay Wilder will face Jai Opetaia on the undercard of Tyson Fury vs Anthony Joshua.It marks the first undercard bout officially announced for the all-British blockbuster, which takes place at Cardiff’s Principality Stadium on December 11.Wilder had been in negotiations to face Oleksandr Usyk – but is now set to take on cruiserweight king OpetaiaGettyReports emerged late last month that Wilder had agreed terms to box lineal cruiserweight king Opetaia, who will be moving up to heavyweight for the clash.Dana White has now made it official, no doubt adding fuel to the fire of his ongoing feud with Eddie Hearn over his involvement in Fury vs AJ.“The co-main event is officially set,” White said on social media, announcing Wilder vs Opetaia.“These two guys have a combined 67 knockouts. You do not want to miss this fight, live only on Netflix.”Wilder, who hasn’t fought since a split decision win over Derek Chisora in London in April, was previously in talks to fight Oleksandr Usyk.But talks collapsed, with Usyk seemingly set on a move down to cruiserweight to eventually face David Benavidez.Wilder has just three wins since settling his iconic trilogy with Fury in 2021, having traded blows with the likes of Joseph Parker and Zhilei Zhang.The 41-year-old is supposedly also exploring a future fight with WBA heavyweight champion Murat Gassiev.Opetaia, meanwhile, is signed to White’s Zuffa Boxing and won the promotion’s inaugural cruiserweight belt in March.The Australian is undefeated in 31 professional fights, with 24 KOs, and stopped Noel Mikaelian last time out in September.View Tweet: https://x.com/danawhite?ref_src=twsrc%5EtfwHe is currently in a legal battle with the IBF, having been stripped of his cruiserweight world title by the sanctioning body earlier this year.This is a developing story and is being updated.For the latest updates, breaking news alerts, and comprehensive analysis, refresh this page or follow our real-time news coverage by watching and listening to talkSPORT live.For broader context, explore related coverage on our homepage for the top trending stories. For the latest talkSPORT videos, download the app.talkSPORT cares about getting it right, not just getting it first and because this is a developing situation, details will change. We will be updating this page constantly with verified info, expert takes, and official statements.Stay tuned for further developments as this story continues to break.