A UFC rematch is set to go down in BKFC.
Bare Knuckle FC made the announcement earlier today and the bout will main event the promotion's July 23 show.
VanZant (8-5 MMA) defeated Ostovich (4-6 MMA) via submission at UFC Fight Night 143 in January 2019 during their main card opening bout.
The 27-year-old VanZant will be making her return to BKFC after being on the wrong side of a 49-46 unanimous decision against Britain Hart in her promotional debut in February.
Ostovich will be making her BKFC debut following her release from the UFC earlier this year.