Tyson Fury claims he will "smash through everyone" as he intends to prove that he is a better fighter than heavyweight champions Anthony Joshua and Deontay Wilder.
Fury, who has not fought since outpointing Wladimir Kitschko, begins his quest to return to heavyweight boxing's top-drawer when he takes on Sefer Seferi on June 9, and he believes that IBF-WBA-WBO champ Joshua and WBC titleholder Wilder should be wary ahead of his return.
"I can't sleep at night knowing people think AJ is better than me or Deontay Wilder is better than me," Fury said on Instagram.
"I will separate them from their senses. I want to hit AJ with six left hooks in a row. I'm more determined than I've ever been," Fury added.
"If there are any cruiserweights or light heavyweights out there who want to move up into my division you better get it done because I'm smashing through everyone."
Fury (25-0, 18 KOs) is targeting five fights before 2018 is out before a shot at the heavyweight titles next year, but he recently admitted that it was Deontay Wilder's taunts that persuaded him to return to boxing.
"It was Deontay Wilder who spurred me on where he said I couldn't do it, couldn't return. He said Tyson Fury is done. I can have a hand tied behind my back and beat Wilder.
"I was walking my dog along the canal and I looked at myself and thought 'you fat pig'. I felt like jumping in and drowning myself. The fire is back now. I'm ready to fight today, tomorrow, whenever.
"Every time I went to the pub and had 10 pints I thought, 'yes, I want to fight now' but I didn't. I'm in a very, very good place. I feel fully focused. Fit, strong and fast. I needed that time to off to recoup and rest."