Bellator MMA officials announced the bout on Monday. The event will take place at Valley View Casino Center and air on Spike TV.
This is the second time Bellator has booked this 205-pound contest. The two were originally supposed to meet at Bellator 123, but DeBlass, 32, was forced off the card due to injury.
Lawal (13-4), who is also known as "King Mo," remained on the Sept. 5 card and earned a second-round TKO over Dustin Jacoby.
Fighting out of American Top Team in Coconut Creek, Florida, Lawal has alternated wins and losses in his past five bouts. This will mark his fourth appearance of 2014. In August, he signed a multiyear contract extension with Bellator.
"Tom has been talking since we were supposed to fight in September," Lawal said. "He's a good fighter, but my jab is going to erase his teeth and swell up his eyes. My right is going to make him see stars and bright lights. Another fight, another win."
DeBlass (9-2) is 2-0 with two knockouts since signing with Bellator early last year. Prior to that, he went 0-2 in a brief stint with the UFC.