The WBC have ordered Alexander Povetkin to face their former champion Bermane Stiverne for the interim title.
However, with Wilder having undergone hand surgery in the wake of his recent defence against Chris Arreola, the governing body have decided to match 36-year-old Povetkin with Stiverne (25-2-1-KO21).
Negotiations for the fight can continue up until September 16, at which point the event would go to purse bids.
Haiti-born Stiverne, who had been considered a potential second challenger to Anthony Joshua's IBF world title, lost the crown with a unanimous points defeat to Wilder (37-0-KO36) in January 2015.
Wilder is targeting January for his comeback bout, meaning the winner of Povetkin v Stiverne could find themselves challenging for the full version of the title immediately.