If he can get himself back in top shape, former world champion Tyson Fury (25-0, 18 KOs) believes he is fully capable of taking out IBF, IBO, WBA world champion Anthony Joshua (20-0, 20 KOs).
Fury has been out of the ring for nearly two years, since he dominated Wladimir Klitschko back in November 2015 in Germany - in what was a major upset - to capture the WBA, IBO, IBF, WBO titles.
Joshua accomplished a similar feat in April of this year, when he stopped Klitschko in the eleventh round. But it was a very competitive, action fight that saw Joshua himself get dropped and in trouble, before rallying in the late rounds for the stoppage win.
Fury is realistic, he is out of shape at the moment and needs to get himself in order before a ring return is even considered.
"There's a lot of heavyweights out there who can give me problems if I'm not 100 percent," Fury told IFL TV.
"In order for me to regain my throne, I need to be 100% fit, motivated and have the drive to continue to get back the belts."
Before he reclaim his boxing license, Fury must solve an ongoing issue with drug testing agency UKAD - who claim Fury tested positive for a banned substance in early 2015 - which he denies.
"I'm totally innocent, I've done nothing wrong," Fury said. "I've been everything, but the one thing I haven't been is a drugs cheat."
Fury believes his victory over Klitschko was far more impressive, because he was barely hit and never found himself in any difficulties. Based on that, he feels confident in his ability to outbox Joshua.
"I'm willing to fight all the heavyweights out there. You've got men holding my belts they got out the dustbin. I'm the only man standing here today that has beaten a champion," Fury said.
"I'm on the comeback, I'm hungrier than I've ever been. I'll be the underdog. I've been doubted and doubted many times. But I'm still unbeaten, I'm still young ... the most important thing is getting the (doping) case out of the way, then we can talk turkey.
"But looking at the division, I have nothing to be afraid of at all. I will school AJ. He didn't play with the super champion (Klitschko) like I did in his own backyard."