Contracts have not been signed, but the promotion is close to finalizing the matchup for UFC 271 on Feb. 12 in Houston.
Lewis (26-8) is a former two-time title challenger. He fought Ciryl Gane for the interim title in August, and lost via third-round TKO. Lewis is from Houston and admitted after the fight the pressure of fighting for a title in his hometown impacted his performance. Next month will mark his first fight back in Houston since that loss.
The 36-year-old holds the record for most knockouts in UFC history with 13. He scored a first-round knockout over Chris Daukaus in his most recent fight in December in Las Vegas.
Tuivasa (14-3), of Sydney, is riding a four-fight win streak. He has knocked out his last four opponents, including three in 2021.