5 in London.
The 32-year-old Briton has not fought since February when he won the WBC world heavyweight title in Las Vegas with a seventh-round stoppage against Deontay Wilder.
"The Gypsy King is returning in 2021," Fury wrote on Twitter https://twitter.com/Tyson_Fury/status/1328034997182271490. "Only those that have supported me 100% since my comeback will be with me for the glory."
Fury had earlier announced his next fight would be in December in London against an unnamed opponent.
He did not say why the December date was off, nor did he say who his opponent would be next year.
American Wilder had called on Fury to agree to a third fight after the first bout in 2018 ended in a draw. However, Fury refused after Wilder accused him of cheating in their February bout. (Reporting by Rohith Nair in Bengaluru Editing by Robert Birsel)