Alexey Oleynik will lock horns with Walt Harris at UFC Ottawa on May 4.
ESPN.com was first to report the heavyweight booking. UFC Fight Night 150 takes place at the Canadian Tire Centre on May 4 and will stream on ESPN+. A headliner for the card has not been announced.
Olyenik has won four of his last five Octagon appearances, including a first-round submission of Mark Hunt in his most recent outing at UFC Fight Night 136. The 41-year-old Moscow, Russia, native is 57-11-1 as a professional, with 45 of those victories coming by way of submission.