text: Rothwell was scheduled to face Philipe Lins on March 13, 2021, at UFC Fight Night 187. However, during the week leading up to the event the bout was removed from the card due to undisclosed reasons. The pairing remained intact and  the bout was rescheduled on May 8, 2021, at UFC on ESPN 24. While Rothwell made weight without issue, Lins never showed up to the weigh-ins and withdrew from the bout due to an illness. The bout was rescheduled again for May 22, 2021, at UFC Fight Night: Font vs. Garbrandt. However, yet again, Lins was pulled from the event for undisclosed reason and he was replaced by newcomer Askhar Mozharov. Just hours later, the Ukrainian announced he would not be able to get a visa in time for the event, and he was replaced by Chris Barnett. He won the fight via guillotine choke submission in the second round.
  Rothwell faced Marcos Rogério de Lima on November 13, 2021, at UFC Fight Night 197. After Rothwell was stunned multiple times on the feet, referee Herb Dean stepped in to stop the fight, though he allowed Rothwell to attempt a takedown before officially calling off the fight as a TKO win for Lima.
  Rothwell was scheduled to face Alexander Gustafsson on May 21, 2022, at UFC Fight Night 206. However, at the end of March, it was announced that Rothwell asked for his release and it was granted from the UFC.
  Bare-knuckle boxing
  Bare Knuckle Fighting Championship
  On April 25, 2022, it was announced that Rothwell joined Bare Knuckle Fighting Championship. He won his first two fights with the promotion.
  In his third fight for the promotion, Rothwell was scheduled to face Todd Duffee at BKFC 56 on December 2, 2023. However, on November 30, it was announced the bout was cancelled due to Rothwell having an illness. The fight against Duffee has been rescheduled for BKFC Knucklemania IV in Los Angeles on April 27, 2024. Rothwell won the fight by technical knockout after Duffee was knocked down and injured in the first round.