The card has not yet been announced by the promotion.
The original matchup was postponed just hours before Friday's weigh-ins due to a Chiasson injury. Ladd requested a new opponent, calling out former champion Miesha Tate, who broke a five-year hiatus on July 17, but with short notice, the UFC couldn't find a replacement to keep Ladd on the card.
ESPN ranks Ladd No. 4 in the division and Chiasson No. 10. A Ladd win could put her in position to challenge for the title in her next fight.
Amanda Nunes defends her belt against Juliana Pena at UFC 265 on Aug. 7.