Former world champion Oleksandr Usyk is set to make his heavyweight debut against Carlos Takam at the MGM National Harbor in Maryland, USA on May 25.
Ukrainian fighter Usyk dominated the cruiserweight division winning WBA (Super), WBC, IBF and WBO titles between September 2016 and November 2018.
Usyk, who is yet to taste a defeat as a professional boxer, will now begin his career in the heavyweight division against French-Cameroonian Takam.
"May 25 marks a major moment in my career when I move to the heavyweight division," Usyk told Sky Sports.
"At cruiserweight, I did it all and became the undisputed champion and that is my goal now in the heavyweights.
"This is the ultimate challenge and it begins on May 25 against Carlos Takam. It's a tough first fight but I need to test myself against world class opposition on my new road to undisputed."
Takam challenged British boxer Anthony Joshua for the IBF, WBA and IBO World titles in October 2017 and he lost.
"Usyk has achieved everything in the cruiserweight division - I am ready to welcome him to the new world of heavyweight boxing," said Takam.
"I can promise that this will be a great fight and I will provide Usyk with a huge test on his heavyweight debut. I have huge ambitions of my own in the division and this fight will provide me with the chance to prove that."