Saint-Étienne On 6 May 2020, Gourna-Douath signed his first professional contract with
Saint-Étienne at the age of 16. He made his professional debut in a 2–0
Ligue 1 win over
Strasbourg on 12 September 2020.
Red Bull Salzburg On 13 July 2022, Austrian club
Red Bull Salzburg announced the signing of Gourna-Douath on a five-year contract. The transfer fee paid to Saint-Étienne was a reported €15 million, making him the most expensive signing in the history of Austrian football.
Loan to Roma On 3 February 2025, Gourna-Douath joined
Serie A club
Roma on a loan deal until the end of the 2024–25 season, with an option of a permanent move.
Loan to Le Havre On 16 January 2026, Gourna-Douath returned to France and signed with
Le Havre on loan. ==International career==