Born in
Saint-Priest, He then played for English club
Burnley, before signing for
Accrington Stanley in February 2023. On 20 May 2023, it was announced that Gomez Mancini would leave the club when his contract ended on 30 June. On 24 July 2023, Mancini signed for
National League side
Hartlepool United after impressing during a pre-season trial. He scored his first league goal for Hartlepool in a 3–1 home victory against
Maidenhead United. After an impressive start to the season which had seen Mancini voted as the supporters' Player of the Month for August, it was announced on 1 September that he would be ruled out for a minimum of six months due to a hamstring injury. However, Mancini returned early from injury, making a substitute appearance in a home defeat to
Oldham Athletic on 26 December. He sustained a groin injury at the end of January 2024. At the end of the season, Hartlepool took the option to extend his contract. At the end of the
2024–25 season, it was announced that he would be released by Hartlepool at the end of his contract. On 2 July 2025, Gomez Mancini joined National League side
Rochdale on an initial one-year deal. In October 2025, Rochdale manager
Jimmy McNulty told the media that Mancini would be out for at least six weeks due to a muscle injury. ==International career==