Muhammed Lawal will face BAMMA combatant Brett McDermott Dec. 29 in RIZIN Fighting Federation's inaugural heavyweight grand prix.
The news comes after the withdrawal of Lawal's original opponent, Mark Godbeer, due to injury.
The Englishman McDermott comes into his bout opposite King Mo with a 5-2 record (four knockouts), going 2-1 in his last three under the BAMMA banner. McDermott first made a name for himself in the world of sports as a professional rugby league footballer, most notably representing England's Barrow Raiders.
He retired from the sport in 2011 after testing positive for anabolic steroids.