Chelli made his pro-debut at
York Hall in London on 24 February 2017, stopping Jacob Lucas in the third of their scheduled four-round encounter. He won his first professional title in his eighth fight, claiming the vacant Southern Area
super-middleweight crown with a unanimous decision victory over Jimmy Smith at
Wembley Arena on 27 April 2019. On 10 November 2020, Chelli defeated Vladimir Georgiev by unanimous decision and Mike McGoldrick via a second round stoppage at
BT Sport Studio in
Stratford to win the
Boxxer VII tournament and secure a two-year contract with the promotional company. He became English super-middleweight champion by dethroning
Germaine Brown with a unanimous decision success at Wembley Arena on 11 June 2022. At the same venue on 11 February 2023, Chelli took the
WBA Continental super-middleweight title thanks to a unanimous decision win over
Anthony Sims Jr. He lost his English title to Mark Jeffers at
Manchester Arena on 1 July 2023, going down to a unanimous decision defeat. Chelli challenged
British and
Commonwealth super-middleweight champion
Jack Cullen at
Liverpool Arena on 20 January 2024, winning the bout by unanimous decision. In his first defense at
Oakwell Stadium in
Barnsley on 3 August 2024, he lost his titles via unanimous decision to
Callum Simpson. After more than 10 months out of the competitive boxing ring, Chelli returned to face Adam Hepple for the vacant English
light-heavyweight title at York Hall in London on 27 June 2025. Ahead on all three judges' scorecards and having already sent his opponent to the canvas in the ninth round, Chelli won the fight by knockout in the 10th and final round when Hepple failed to beat the referee's 10-count after being dropped by a punch to his body. He is scheduled to take on former two-weight world champion
David Morrell at
Co-op Live in
Manchester on 9 May 2026. ==Personal life==