Tyson Fury plans to weigh in at his career-heaviest for the trilogy against Deontay Wilder.
He will face the 'Bronze Bomber' in a third bout next weekend, returning to the ring for the first time since February 2020.
And he weighed in 273lbs for the showdown last time, which was widely regarded as one of his career-best victories.
But he plans to weigh even more for this clash, but he has admitted his preparations may have been hampered by testing positive for Covid-19.
“I’ve been working on it,” Fury said in a virtual press conference. “I had COVID, I had a month off with me baby that was unwell.
"Eating all that stuff takes a lot. I don’t know if I’m going to be at me career heaviest, but giving it me best, best shot. Don’t worry about that. But I am certainly over 270lbs right now.
"It’s either going to be me or Wilder. I’ve never had a bad training camp, and I’m in the best shape of my life. I’m injury-free, which is the most important thing. I’m really looking forward to it, and I can’t wait.”
Fury has suffered much disruption to his schedule this year testing positive for coronavirus and delaying the initial fight date.
He was also set to face domestic rival Anthony Joshua, before an arbitration case forced him to seek the rematch with Wilder.
And it could now be further in jeopardy with the former two-time world champion losing his unified world titles to Oleksandr Usyk.
In the wake of Joshua's defeat, Fury has admitted he was "absolutely wounded" by the result, and has refused to mock his British foe.
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"Usyk did his job, and that's all I know," Fury said when asked for an assessment of the Ukrainian's performance. "He won his fight, and good luck to him.
"There's not much to assess or express, did I watch the fight? Yes I did. Was I absolutely wounded when Usyk won? Yes I was. I was hoping that Joshua could win the fight, but he couldn't and that's none of my business.
"One thing that I have learned in my life, not that I've ever been involved in anybody else's business, is to keep my nose out of everyone else's business - it's none of my concern.
"My only concern is beating Deontay Wilder, that's the most dangerous heavyweight out there, and in my opinion, Wilder beats Joshua, Usyk, all the rest of the division comfortably, but he cannot beat me."
"I've no real concern about anything else other than Wilder, I've got a mammoth task ahead. It's a very dangerous task that I'm giving 100% focus, and I don't care who I fight after this. Let me get through Wilder first and then on Sunday morning we can talk turkey about who I'll fight next."
Fury has backed himself to ignore Wilder's excuses and secure another stoppage victory in Las Vegas next weekend.
And he has been forced to defend claims from his opponent that he faked the virus to delay the trilogy in recent days.
