The Ukrainian, who currently holds the boxing association's 'super' belt, alongside the WBO and IBF titles, had been tipped for a clash with Fury, who holds the WBC crown.
But Dubois, who retained his WBA 'regular' belt this month against Kevin Lerena, has now been ordered to face Usyk next for his crown, in a move that would unify both of the federation's titles.
If there is a saving grace for an Usyk-Fury bout, it is that the latter is represented by Frank Warren, who also handles Dubois through Queensberry Promotions.
That could mean Dubois would wait for the winner of a potential unification showdown, and subsequently face them for a shot at all world titles.
Usyk was also ordered by the IBF last month to hold a mandatory defence against Croatia's Filip Hrgovic, who could be another potential opponent if the Fury bout does not come next.
After defeating Derek Chisora in London earlier this month, Fury talked up Usyk and fellow Briton Joe Joyce as his likely next opponents.
Joyce is currently the WBO's interim champion, and has professed his interest in a clash with his countryman in recent weeks.
Dubois has a 19-1 career record, with his only loss coming at the hands of Joyce.
Former undisputed cruiserweight champion Usyk outclassed Joshua at Tottenham Hotspur Stadium on Saturday to win the IBF, WBA and WBO titles by unanimous points decision.
Joshua, who is now 24-2 after suffering a second defeat in four fights, said after his latest surprise loss he is "110 per cent" up for a rematch to win back his belts.
Speaking at a news conference in Kiev, Usyk's promoter Alexander Krassyuk confirmed the wheels are in motion for the two men to meet again, likely in early 2022.
"The rematch was specified in the contract," Krassyuk said. "It has already been activated in principle, from the side of Joshua.
"So I remember when we discussed with Oleksandr the issue of rematch, he was delighted and said, 'Wow, cool, I will beat [Anthony] twice'."
Usyk's southpaw stance and smooth footwork troubled Joshua from the outset and the unbeaten Ukrainian left his opponent on the ropes and desperate for the bell in the final round.
However, Joseph Parker – the first man to take Joshua the distance in their 2018 unification fight – has backed the Briton to come back stronger if the rematch goes ahead.
"Usyk showed everyone watching tremendous skill and footwork and movement. You just saw him outbox and outsmart AJ for the 12 rounds," Parker told Stats Perform.
"But [Joshua's] a smart man, and he's got a smart team. He's faced a loss and adversity, and he's come back with a better game plan. That's what he's going to need to do.
"I think I saw an interview saying he's already watched the fight straight after it happened, and he just needs to make those adjustments and how to counter someone like Usyk.
"Who wins the rematch depends on the training, it depends on who shows up on the day. But going into the rematch, Usyk would have big confidence.
"It's pretty crazy how he came from the cruiserweight division, unified champion of the world, and then has three fights and he's the unified champion of the world.
"That's the goal of a lot of heavyweights, to be champion of the world and be unified champ. It's so crazy how things happen."
Joshua's promoter Eddie Hearn said he expects the rematch to take place in February or March next year, and it is "very likely to happen in the United Kingdom", as he effectively ruled out staging the high-profile bout in Ukraine.
But two-weight world champion Usyk, who is now 19-0, reiterated his desire to face Joshua in front of a packed crowd at the Olympic Stadium in his homeland.
Usyk said: "How does Hearn know that in February at the Olympic Stadium it is bad to box? Has he ever fought in February at the Olympic Stadium?"
Usyk concluded his dominance of the 200lbs division with an eighth-round stoppage of Tony Bellew in November 2018, although he has only fought once since due to bicep and elbow injuries.
The undefeated 33-year-old stopped unheralded American Chazz Witherspoon on his heavyweight debut last October and now faces a mouth-watering clash against former world-title challenger Chisora at the O2 Arena.
"As a cruiserweight, I reached the highest heights as undisputed champion and now I am following the same path as a heavyweight," said Usyk, who is currently ranked as the WBO's mandatory challenger – meaning a shot at unified champion Anthony Joshua could be on the agenda for the winner of this bout later in 2020.
"I expect a real test in Chisora – he is strong, tough and resilient. I recall being an amateur and watching his fight with Vitali Klitschko. It seemed so big and far away.
"Now I am myself taking a fight against Chisora. I am working hard in my training camp to show a spectacular performance on May 23."
Chisora is coming off a run of three consecutive victories following his dramatic 11th-round loss to domestic rival Dillian Whyte in December 2018 and the 36-year-old has pledged to provide a stern test of Usyk's heavyweight credentials.
"Usyk reckons he can step up and survive with the big boys. He may be the undisputed cruiserweight champion of the world but on May 23 he will find out what it feels like to be hit by a real heavyweight," he said.
"He is coming to my backyard, I'm going to remind him exactly why he hid in the cruiserweight division and also get revenge for my boy, Tony Bellew. This will be war."
Usyk became the first undisputed heavyweight since Lennox Lewis in May following his split-decision win over Fury, ending the Gypsy King's unbeaten record.
Fury insisted that while he thought he won the fight, the only reason Usyk had been able to deliver a late onslaught was that he was "enjoying it too much and messing around".
"Oh my god, no way! Okay, no problem. The next fight will be easy [for him too]," Usyk told Sky Sports in response to Fury's comments.
"For me, my fight will be hard because Tyson Fury is a big man, a good boxer, with a good boxing IQ.
"But if Tyson says for him it will be easy, ok, no problem. I see for Tyson Fury, I see for the eyes of Tyson Fury, it's not easy. It will be hard, very, very hard.
"Tyson, don't be afraid - I will not leave you alone."
Fury had started the contest in the ascendency, landing an uppercut to the chin of Usyk which staggered the Ukrainian in the sixth round.
However, Usyk showed his powers of recovery once again, unloading on Fury with a flurry of punches that forced a knockdown in round nine.
Referee Mark Nelson stepped in to give Fury a count as he stumbled across the ring with just the ropes keeping him upright, managing to survive the full 12 rounds.
"For me, it doesn't matter," Usyk said on the officiating in Saudi Arabia. "Every referee, it's a professional guy.
"The referee does his job. Maybe my last punch would be dangerous for Tyson Fury. It's good.
"Tyson has a big family, I have a big family. Listen, we win. Everything is ok. I do not think about the referee after the fight. We win, thank god, all good, everything is ok.
"A lot of people say, 'Oh the referee took your knockout win' and say 'Referee bad'. I think no, the referee is good. It's just talking. Blah blah blah."
The heavyweight champion was widely reported to have been bulking ahead of going toe-to-toe with Joshua in Saudi Arabia but, clocking in at 15 stone and 11 pounds, was only marginally heavier than his weight in north London last year.
Usyk, always keeping his cards close to his chest, refused to confirm whether it was a ploy for people to think he would be showing a heavier weight for Sunday's bout and was not drawn into pre-fight verbal jabs when interviewed after the scales.
Joshua also downplayed the significance of the weigh-on and face-off, having clocked in four and a half pounds heavier than last September, and remains focused on getting it done in the ring.
"For me, personally, the face-off doesn't mean anything. It's about throwing leather, the face off doesn't win fights. All of this stuff, weight, none of it matters to me, I'm just looking forward to the fight," he said.
The Brit has been preparing for the fight to go the full distance, just as it did at the Tottenham Hotspur Stadium when he lost his belts, adding: "I'm 100 per cent ready for 12 rounds and anything less than that is a bonus."
The pair were initially set to meet on May 23, but the coronavirus pandemic saw the bout at The O2 Arena in London postponed.
Former undisputed cruiserweight world champion Usyk (17-0) has been made to wait for his second heavyweight test, having stopped unheralded American Chazz Witherspoon on his debut last October.
The Chisora fight will go ahead just over a year on from that contest, however, after an agreement was announced on Wednesday.
"I have really missed boxing," Usyk said. "I am working hard in my training camp to show a spectacular performance on October 31.
"I expect a real test in Dereck - he is strong, tough and resilient. He is a really big guy and he hits hard.
"As a cruiserweight, I reached the highest heights as undisputed champion and now I am following the same path as a heavyweight.
"I need to test myself against world-class heavyweights on my new road to undisputed and Dereck stands in front of me.
"Many people say that Dereck is a monster, but deep down he is a kind man. I don't expect to see that good side of him.
"I know that he wants to break me, but I am water, wind and fire all together. Dereck Chisora, I am coming for you."
Chisora (32-9) added: "Usyk, I've been ready for you all year.
"It's my home turf and, after such a tough year for everyone, I'm going to give the British public the Halloween party they deserve and finally get revenge for my boy Tony Bellew."
Usyk last fought in August, when he successfully defended the WBA Super, IBF, WBO, IBO and The Ring heavyweight belts by posting a second win over Anthony Joshua in Jeddah.
The 35-year-old immediately targeted a meeting with Fury after that triumph, but the Gypsy King's desire to fight in 2022 means he will face Derek Chisora for a third time in December.
Fury's co-promoter Bob Arum recently revealed talks with Uysk's camp were imminent, and the Ukrainian – who signed up with the Kyiv Territorial Defence following Russia's invasion of the country in February – would love to take the bout to his homeland.
"The organisers are trying to figure out where they can earn more money," Usyk said at an event in Lisbon. "For me, yes, I would really like to fight in Ukraine.
"The country is really capable of hosting this kind of fight. I would be really happy to see it happen in the Olympic Arena in [Kyiv], Ukraine.
"But it is not me who chooses the venue, so I guess it will be Saudi Arabia."
Usyk then moved to set a timeframe for any fight with Fury, adding he was not considering any other opponents for early 2023.
"Right now, my team is seeking conversations with Tyson Fury, and he is really an unpredictable person, so we can't guarantee when," he added.
"For me, the idea would be to fight maybe in early February or the beginning of March, like March 4, because I am an orthodox Christian.
"During the great fasting before Easter I do not fight, so it should be all before or then after orthodox Easter [April 16].
"I want to fight with Fury because I need the fourth [major] belt, and I don't want to fight with anyone else until I have the fourth belt."
Fury has already defeated Chisora on two occasions – winning by unanimous decision in July 2011 before stopping him after 10 rounds in November 2014, and Usyk is unsure why he needs the trilogy fight.
"I don't know why he needs this fight," he added. "Maybe he thinks because it would be one year without a fight, now he needs it. I think it is some manoeuvre, because I don't know why he needs this."
The 35-year-old holds the WBA Super, IBF, WBO, IBO and The Ring heavyweight belts after defeating Anthony Joshua for a second time in last month's rematch.
Usyk's split-decision victory over Joshua in Saudi Arabia was supposed to clear the way for a unification bout with Fury for all the belts in the sport’s blue-riband division.
However, with Usyk ruling out a return to the ring this year, Fury is now in advanced talks with Joshua over a 'Battle of Britain' showdown in December.
Usyk is hopeful of facing Fury down the line, with super-middleweight champion Canelo Alvarez also on his list of targets before ending his career on home soil in Kyiv.
"I can have three more fights at the very most," Usyk said in an interview posted on his YouTube page.
"It is the most realistic to be in my top form. With Fury, Canelo and a farewell fight at Olympiyskiy.
"With Canelo he said that he wanted to fight me. It would be a freak fight just for the sake of earning money.
"I only need to beat Fury and then it is time to retire for me. The unification of all the belts is much more important than just a fight or another defence.
"I want to outbox Fury and I don't want to work that much just for another defence. There is much more that I can achieve."
Canelo is the undisputed super-middleweight champion after claiming victory in the final fight in his trilogy with Gennady Golovkin in Las Vegas last weekend.
The weight disparity between Usyk and Canelo makes any bout difficult to arrange, but the latter confirmed last month he is interested in facing the Ukrainian.
"It's difficult but I don't care," he said. "I like that type of challenge. I don't care. It's going to be difficult I know, but I love boxing. I love being in that type of situation."
The 35-year-old holds the WBA Super, IBF, WBO, IBO and The Ring heavyweight belts after defeating Anthony Joshua for a second time in last month's rematch.
Usyk's split-decision victory over Joshua in Saudi Arabia was supposed to clear the way for a unification bout with Fury for all the belts in the sport’s blue-riband division.
However, with Usyk ruling out a return to the ring this year, Fury is now in advanced talks with Joshua over a 'Battle of Britain' showdown in December.
Usyk is hopeful of facing Fury down the line, with super-middleweight champion Canelo Alvarez also on his list of targets before ending his career on home soil in Kyiv.
"I can have three more fights at the very most," Usyk said in an interview posted on his YouTube page.
"It is the most realistic to be in my top form. With Fury, Canelo and a farewell fight at Olympiyskiy.
"With Canelo he said that he wanted to fight me. It would be a freak fight just for the sake of earning money.
"I only need to beat Fury and then it is time to retire for me. The unification of all the belts is much more important than just a fight or another defence.
"I want to outbox Fury and I don't want to work that much just for another defence. There is much more that I can achieve."
Canelo is the undisputed super-middleweight champion after claiming victory in the final fight in his trilogy with Gennady Golovkin in Las Vegas last weekend.
The weight disparity between Usyk and Canelo makes any bout difficult to arrange, but the latter confirmed last month he is interested in facing the Ukrainian.
"It's difficult but I don't care," he said. "I like that type of challenge. I don't care. It's going to be difficult I know, but I love boxing. I love being in that type of situation."
Usyk's promoter Alexander Krassyuk raised the question after the two camps were unable to compromise on the financial details of the fight, such as any potential rematch purse split.
The pair were due to meet on April 29 at Wembley Stadium, having previously agreed to a 70-30 purse split in favour of Fury.
Usyk's manager, Egis Klimas, confirmed his client had pulled out after seemingly growing frustrated at Fury's continued demands.
In an interview with Sky Sports, promoter Krassyuk explained: "The Usyk side pulled out of further negotiations as the Fury side never had enough [and wanted] to pull everything and all rights to their side, I don't want to go into details as all negotiations were confidential, but I will tell you one thing, when a fighter doesn't want to fight he overprices himself knowing that the fight won't happen.
"They most likely forgot that Usyk is holding the majority of belts in the heavyweight division and Tyson just has one."
Fury only holds the WBC heavyweight title, after his trilogy victory over Deontay Wilder, whereas Usyk holds the WBA, IBF, and WBO belts after twice defeating Anthony Joshua.
Krassyuk added: "They claimed Tyson is a face and must have all the rights, but look at statistics on pay-per-view with Tyson vs Chisora and Usyk vs Chisora and then tell me who is who?"
Last year Fury's fight with Derek Chisora reportedly reached 500,000 pay-per-view sales, under half those supposedly made for when Usyk fought the same opponent in 2020.
A deadline of April 1 for the fight to be agreed had been set by WBA president Gilberto Mendoza, and this latest setback looks likely to put pay to any chance of the event being set before that date.
Usyk was a split-decision victor in his rematch against Anthony Joshua on Saturday in Jeddah, retaining the WBA, IBF and WBO belts that he took off the same opponent at the Tottenham Hotspur Stadium last year.
It means that the Ukrainian would now just need the WBC belt to make him only the second fighter in the four-belt era behind Claressa Shields to become undisputed in two different weight classes, having already held all four titles in the cruiserweight division.
That WBC belt belongs to Fury, who has not been in the ring since April when he defended his strap by stopping Dillian Whyte with a brutal uppercut in the sixth round at Wembley.
Fury has since claimed to be retired, but it appears that he could be tempted back into the ring to face Usyk and crown an undisputed champion in the heavyweight division, after telling his Instagram followers he would "annihilate" both Usyk and Joshua following the conclusion of their rematch.
And Usyk's promoter Krassyuk is confident the fight between the two undefeated titleholders will happen, telling Sky Sports on Tuesday: "It's in the making."
Speaking on Monday, meanwhile, Fury's co-promoter Frank Warren also indicated he is confident of the Briton getting in the ring with Usyk.
"[Fury] and Usyk would be a really good fight," Warren told BBC Radio 5 Live. "It's a fight that I think will be made because both teams would like to see that happen.
"Usyk said after the fight that it's the only fight he's interested in, and it's certainly the same case with Tyson. It's just a matter of where it will generate the most income because it's a unique fight, a historic fight."
WBA-Super, IBF, WBO and IBO champion Usyk and Fury are expected to do battle early in 2023.
Bob Arum, who promotes WBC champion Fury, recently stated an agreement has been reached for the Brit to step into the ring with Usyk next year, with a date and a venue to be settled upon.
Usyk's promoter Alex Krassyuk does not envisage any stumbling blocks.
He told Sky Sports: "Probably yes [the contracts have been issued], but we have not received them yet,"
Krassyuk added: "Yes, we are on our way."
WBC president Mauricio Sulaiman is relishing the prospect of seeing Fury and Usyk going toe-to-toe.
He told Sky Sports: "That's a fight that the WBC has promoted and has fought for since several years when [Deontay] Wilder was champion and [Anthony] Joshua was a champion.
"We put all the flexibility and possibility of the WBC to participate in doing so. Now if Usyk comes into place and Fury fights him that would be a tremendous happening for the world."
An eagerly awaited battle between Fury and Usyk is in doubt as the two parties have been unable to strike a deal.
Usyk's promoter Alex Krassyuk this week revealed that Fury had rejected a 60-40 purse split in favour of the winner for a bout on April 29.
WBA-Super, IBF, WBO and IBO champion Usyk on Friday put the ball firmly in Fury's court by agreeing to take a smaller slice of the cake, provided the Englishman supports war-torn Ukraine.
He stated on social media: "Hey greedy #Belly I accept your offer seventy/thirty split to fight on April 29th at Wembley.
"But you will promise to donate 1 mln pounds to Ukraine immediately after the fight. And for every day of your delay you will pay 1 per cent from your purse to Ukrainian people.
Deal???? @tysonfury"
Should a fight against Fury not materialise, Usyk has a three-man waiting list of mandatory opponents – with WBA mandatory Daniel Dubois at the front due to the nature of the governing bodies' rotation system.
If the Brit was ruled out by the injury he sustained in his last fight, IBF mandatory Filip Hrgovic is next in line, followed by WBO mandatory Joe Joyce.
Negotiations for a clash that would determine the first unified heavyweight champion since 2000 have been ongoing for months but are now on the brink of collapse.
Krassyuk revealed this week that Fury had rejected a 60-40 purse split in favour of the winner, with the WBC champ seeking a much higher fee.
That leaves a proposed April bout between Usyk and Fury looking extremely unlikely, with Krassyuk conceding he does not expect the fight to be scheduled.
"It doesn't look likely that we're going to have a fight on April 29, that's my anticipation," he told iD Boxing.
"I can tell you only from the words that I hear from my negotiation partners – Frank Warren and George Warren – according to their reports, Tyson Fury was asking for too much money.
"Even if Usyk would get zero for the fight, it would still not be sufficient for Tyson to cover his wants. But that's actually the point. Normally when a fighter doesn't want a fight, he asks for something impossible and then it's not happening."
Should a fight against Fury not materialise, Usyk has a three-man waiting list of mandatory opponents – with WBA mandatory Daniel Dubois at the front due to the nature of the governing bodies' rotation system.
If the Brit was ruled out by the injury he sustained in his last fight, IBF mandatory Filip Hrgovic is next in line, followed by WBO mandatory Joe Joyce.
Krassyuk expects a mandatory fight to be Usyk's next bout, with the prospect of a clash against Dubois appealing.
"If a Fury fight doesn't happen, which it's not really likely to happen, I think Usyk will have to fight the mandatory. This [Dubois] is actually the next step for Usyk, we have to comply with it," he added.
"It's not the worst fight for the UK. Dubois is English, Usyk fought a couple of times here so he's probably a bit known in the UK. And this is a fight where an Englishman is fighting for three belts at heavyweight. It's a bit more than just a normal heavyweight fight.
"It's still huge. Dubois went through some hell in his last fight, so probably he's recovered, we expect that he did, but we have to see the medicals. It's something to be disclosed within the next couple of days.
"We're still expecting the official decision from Fury. Once we know from Fury officially that the fight is off, then we start working on the mandatory."
Valdez (29-0) dethroned Berchelt at MGM Grand, where he floored his fellow Mexican with a devastating left hook in the final second of the 10th round on Saturday.
Having knocked down Berchelt (38-2) twice earlier in the fight, Valdez landed the vicious blow in the 10th as his opponent laid unconscious on the canvas for a few tense moments in Las Vegas.
"There's nothing better in life than proving people wrong. I had a list of people who doubted me. My idols doubted me. Boxing analysts doubted me," Valdez said.
"They said Miguel Berchelt was gonna knock me out. But I got a message to tell everybody: Don't let nobody tell you what you can can and can't do.
"Always work hard and be disciplined in life. Try to do your best, stay disciplined, and never let anyone tell you you can't do something. Prove them wrong."
Valdez – now a two-time world champion having previously enjoyed a reign as WBO featherweight champion for nearly three years – added: "It wasn't easy training in a pandemic, but try to go for your dreams.
"Always train hard, do your best, try to always be number one. Nothing's impossible. My team was a big part of this."
Joshua's ninth-round stoppage of Kubrat Pulev last week kept him on a collision course with Fury, who has not fought since defeating Deontay Wilder to claim the WBC title, which is the only belt Joshua does not own.
Wilder has a rematch clause he can trigger for a third fight with Fury, however, Joshua's promoter Hearn is insistent the only bout either camp is concerned about is one that will crown a Briton as the undisputed champion.
Speaking at the post-fight news conference for Saul 'Canelo' Alvarez's victory over Callum Smith, Hearn said: "They've been ongoing none stop, the next move is drafting of agreements which is going on right now.
"[There's] a lot of work to do on that but only minor points in my opinion to resolve. So I think you'll see over the next few weeks getting into that position where we can get into the market place and look at where that fight might take place. But as I've said before no one is looking at another fight from either team other than that one."
Asked about a verbal agreement, he added: "Yes, yes I mean we have a verbal.
"AJ has a fighting exclusive with Sky, Fury with BT, in America Fury with ESPN, AJ with DAZN. Minor again, then the silly stuff, who walks out first, who gets the better changing room. AJ thinks he's the A side, Fury thinks he's the A side. Anthony Joshua [is the A side] - when you talk about as a global brand and the biggest draw globally in that fight, it's clear it's AJ. He has three of the belts - this is why AJ could fight in December and Fury couldn't.
"It depends where it could take place, if it's in the Middle East I think Ramadan runs until mid-May so the end of May, early June is target for that fight. If it's in the UK May-June is great as well.
"But the only way that fight can take place in the UK is if 90,000 fans can attend. Even then guys could be taking 50 per cent of the purse in another territory, but right now with the UK going into another lockdown, who knows if we'll see those kind of numbers?"
The 38-year-old Walters, who returned from a six-and-a-half-year layoff last year, outworked his opponent for the most parts, as Adorno was also deducted a point for a punch after the bell in round nine.
Walters’ recent squash matches with hapless Colombian journeymen, one of whom was over 45, might have suggested that this was more of a cash-out than a genuine attempt at a comeback. However, the Panama-based boxer proved that was very much not the case and that he clearly still had plenty in the tank.
He steadily took apart the 24-year-old Adorno with crisp jabs over the course of 10 rounds.
At the end, Walters won by scores of 95-94, 97-92, 98-91, as he claimed the WBA Continental Americas lightweight title and improved his ring record to 29 wins, 22 of which are by knockouts. He also has one loss and one draw.
Adorno’s record has now slipped to 18 wins (15 kos) against four losses and two draws.
Walters created history by becoming the first Jamaican to win a world boxing title at home, defeating Daulis Prescott via a 7th round TKO victory at the National Indoor Sports Centre in Kingston for the WBA World Featherweight title.
Walters, who went into retirement shortly after he lost his unbeaten record to former pound for pound king Vasiliy Lomachenko in a seven-round bout in November 2016, will be hoping to extend his winning momentum on return to the ring for his 2024 debut on Wednesday, March 27.
The 38-year-old Walters had comeback victories over Luis Marmol in Colombia February 2023, and Reynaldo Esquivia, nine months later, and another against Adorno would certainly add impetus to his charge going forward.
Although he doesn’t have a particular opponent that he craves, Walters hopes to get in the mix for big fights after this rust-shedding exercise.
“My plan is to go down to 135, where the real warriors are fighting – all the big names. Being a world champion at 135 and a double-world champ [is the goal],” Walters said in a previous interview.
The Panama-based Walters boasts a ring record of 28 wins (22 kos) against one loss and one draw, while Adorno has 18 wins (15 kos) against three losses and two draws.
Walters had turned pro in 2008 after an amateur career that included bronze at the Central American and Caribbean (CAC) Games and two gold medals at the Caribbean Championships in 2005 and 2006. Within a few years he became one of the world’s most exciting fighters of the lower weight divisions after defeating big names like Nonito Donaire and Vic Darchinyan.
Originally from Montego Bay on Jamaica’s north coast, Walters became the first Jamaican ever to win a world boxing title at home when he defeated Daulis Prescott via a seventh round TKO to cop the WBA World Featherweight title in December 2012.
A long-awaited clash between the two men who hold the four divisional heavyweight belts is expected to take place in 2023, despite Usyk being ordered to take mandatory defences.
The WBA has ordered Usyk, its 'super' champion, to defend his belt against Dubois, the 'regular' champion, while the IBF has ordered the Ukrainian to face off against Filip Hrgovic.
Neither would stand in the way of a unification bout, Warren says, with the winner of that clash going on to face Dubois, as the WBA has priority over the IBF in the rotation system.
"They've ordered it, but a unification will come first. And that's what we're working on, which is obviously the fight with Tyson and Usyk," he told talkSPORT.
"So, the winner of that will have to fight our man Daniel. Tyson is our man as well, and he'd have to fight Daniel.
"All the governing bodies will basically go for a unification fight, it's the first time in 25 years we would have had a unification of all the belts in the heavyweight division. That will take priority.
"But what they are saying afterwards, all the fighters, including Joe Joyce, who are number one or interim champions or in Daniel's case heavyweight champions, they will have to make their mandatory defences.
"They've been sitting around for ages for these fights and they [the governing bodies] will order them.
"Once the unification fight has happened then the winner has to start taking care of the mandatories or vacating a particular title, which would be their choice.
"If we can't get the Usyk fight on, which I doubt very much because I think we will get it on, then Usyk will have to defend his title against Daniel. But I don't think that will be a problem with Tyson."
Warrington defeated Martinez in the seventh round on Saturday, to the delight of a partisan crowd in Leeds.
With that victory, his first since October 2019, Warrington regained the IBF featherweight title that he vacated in 2021.
While Warrington's win was a convincing one, it did not come easy, and promoter Hearn confirmed the 31-year-old had sustained an injury.
"Confirmed from the hospital @J_Warrington clean break of his jaw prior to stopping Kiko Martinez to win the World title tonight," wrote Hearn in a post on his official Twitter account, with the caption shared along with a photo of an x-ray of Warrington's jaw.
Warrington has options for his next fight. An all-British showdown with Leigh Wood has been mooted and unification fights with WBC title-holder Mark Magsayo or WBO champion Emanuel Navarrete are also on the table.
