Celso Sidney Ribeiro Leitão (born 18 May 2001) is a Portuguese professional footballer who plays as a forward for Bulgarian First League club Cherno More Varna.
Born in Mirandela, Celso Sidney played youth football for GD Cachão, Chaves, Boavista and West Ham United. On 3 September 2019, he joined Mirandela. On 15 September 2019, Sidney made his Campeonato de Portugal debut in a 1âÂÂ0 away loss against União da Madeira.
On 29 June 2023, Sidney signed with Liga 3 club Amora.
On 10 June 2025, Sidney signed a contract with Bulgarian club Cherno More Varna as a free agent.