Kubrat Pulev will fight champion Anthony Joshua in a world heavyweight title bout in London in mid-December, the Bulgarian claims.
Briton Joshua was originally scheduled to fight Pulev in June but it was postponed because of coronavirus.
Joshua beat Andy Ruiz to regain the WBA, IBF, WBO and IBO heavyweight titles in Saudi Arabia in December.
Pulev is the IBF's mandatory challenger and says both fighters have signed contracts for the fight.
It is not clear if the fight will be behind closed doors because of Covid-19 restrictions.
-BBC