The ex-world champion faces unbeaten Oleksandr Usyk for the Ukrainian’s cruiserweight world titles, hoping to become the first Brit to hold all four belts in any division at the same time.
If Bellew, 35, takes the WBC, WBA, WBO and IBF crowns he will beat heavyweight Anthony Joshua, 29, who holds three titles, to that achievement.
Whatever the outcome, the Liverpudlian is set to hang up his gloves as he no longer wishes to push his body to the limit in a training regime in which he tries to shed two stone to make the 200lb limit.
Bellew said: “For me this is one last dance — four belts and all or nothing.
“We’ll see what Usyk is like when it’s really hard.
“I had one foot out of the door after beating David Haye the second time but I could sign off on this one. If I lose then so be it.
“But I know I am going to beat him. I don’t know how — I just know I’m going to get to him.”
Former-Olympic champ Usyk, 31, won the WBO world title in only his tenth pro bout, adding the other three by his 15th.
Bellew said: “I’ll be fighting someone who I believe is the greatest cruiserweight since Evander Holyfield.
“A fighter who, even after I beat him, will win a heavyweight world title.
“Usyk wanted our fight at heavyweight but I wasn’t going to face such a monster for nothing.”
Bellew has spent the last 12 weeks in isolation, rarely mixing other than with trainer Dave Coldwell and living in a Sheffield hotel room where he heats food in a microwave.
He trains four days a week and allows a couple of days with his family.
Bellew admitted: “The training camp is a hard place to be but you won’t find me complaining.
“I’ll be in the ring with a phenomenal boxer but I won’t be in awe and will test him to the limit.
“I have one-punch power, he doesn’t, and I can iron him out with a single punch.”
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