Fury, 29, turned up at the weigh-in ahead of Chisora’s fight on Saturday with Agit Kabeayel in Monaco.
The self-called Gypsy King joked about his excess flab with Chisora, who has been twice in the past.
It was former world heavyweight champion Fury’s first public appearance since announcing his intention to come out of retirement and fight Anthony Joshua.
He promised to lose the weight and get in shape to fight the unbeaten Joshua next summer.
Fury told Sky Sports: "I've had two years out of the ring. Fat as a pig, hairy as an animal, but still as hungry as a lion.
"You have two years out of the ring and it gives you that va-va-voom to get back in there and bust a few heads.
"Do I need that many warm-ups? I don't think so. Am I a 40-year-old?
“No, I'm 29. Still got a long time in boxing.
“I'm just so happy and excited to potentially be a part of one of the biggest fights in British boxing history.
"People say, why do you think it's that? I'm saying it because two unbeaten heavyweights, one unified champion, one lineal champion, both over six foot six tall, both over 18 stone.
“One nice guy, one bad man - it is what it is. I think the public are going to relish the thoughts of making this fight happen.”
The undefeated star has been out of action since dethroning Wladimir Klitschko in Dusseldorf two years ago - when he weighed 17st 8lbs.
Back in March he admitted his weight had ballooned to an amazing 25 stone after piling on the pounds.
On Wednesday he tweeted a photo of himself in his prime, vowing to get back in shape in 2018.
Fury is still under a doping ban, and cannot return until a UK Anti-Doping hearing takes place.
The British Boxing Board of Control have urged Fury’s legal team to propose a date before his UK Anti-Doping hearing can resume.
Fury is hoping his legal team can clear the way, so he can potentially fight Joshua next year.
Fury said: "I think next summer is ideal and realistic. I'm not going to do it in February or March, because obviously I'm not in shape.
