Tyson Fury has issued an ultimatum that he will walk away from boxing permanently and let his weight soar to 35 stone if a showdown with Anthony Joshua fails to materialise.The Gypsy King made clear his future in the sport hinges entirely on securing the long-awaited Battle of Britain clash with his domestic rival.Speaking after his 12-round points victory over Arslanbek Makhmudov, Fury said: "Heres the thing. If it aint Anthony Joshua next, Im not interested in boxing. Ill eat 1,000 Easter eggs, go up to 35 stone, Im out."Im not interested. Its either him or Im gone again. Im not interested at all. Im not interested in up and comers."TRENDINGStoriesVideosYour SayHe added: Im not interested in someone trying to prove a point over me. I dont care. I dont care about rankings. I dont care about belts."I only care now about that AJ fight, thats the defining fight for British boxing, you know, its either going to happen or its not."However, Fury also left the door open to an alternative, suggesting a third encounter with Oleksandr Usyk could happen if Joshua declines."If AJ don't want it, let's get Usyk in the trilogy. BUT I need some f***ing fair play," Fury stated regarding the Ukrainian who defeated him on two occasions.The 37-year-old returned from a 16-month hiatus with a points decision over Arslanbek Makhmudov across 12 rounds at Tottenham's 1billion venue.Joshua, 36, watched from ringside, filming the action on his phone.When Fury beckoned his rival into the ring for an unprecedented official face-off, Joshua responded with a middle finger and cold stare.Joshua has been recuperating from injuries sustained in a fatal car crash in Nigeria last December, which claimed the lives of childhood friend Kevin Latif Ayodele and recovery therapist Sina Ghami.LATEST SPORT NEWSTyson Fury demands Anthony Joshua fight to his face and AJ responds savagelyTyson Fury beats Arslanbek Makhmudov on points as Anthony Joshua rejects ringside requestTyson Fury pays touching tribute to Ricky Hatton before stunning ring walk with fans forced to standRegarding the rumoured fight, Joshua told Netflix: "Well see. I was just in a serious incident, maybe four months ago."So I really need to check out whats going on in my return to the ring. But Im here, Im keeping my eye in the game."Theres real stuff happening in my life. Its not like Im ducking no one. I know what my job is, I know what Im here to do."Theres just real stuff happening in my life that Ive got to attend to. Once Im 100 per cent, Ill be ready."Fury responded: "God knows Ive had problems myself. Ive attempted to kill myself before. So Ive been through it. Ive been up and down. Ive been one step out of the mental institution."So weve all had problems and thats life unfortunately and you know if youre in this game youre either a boxer or youre not."Netflix announced on social media that the autumn bout is confirmed for their platform, despite Joshua's existing arrangement with DAZN.Frank Warren, Fury's longtime promoter, disputed claims the fight is finalised, though Fury maintains he has already signed his portion of the agreement.Our Standards: The GB News Editorial Charter