Born in Pindamonhangaba, São Paulo, Léo Naldi began his career with a futsal team in his hometown before joining Taubaté's youth setup in 2013.

[1] His first – and only – appearance with the main squad occurred on 1 September 2018, as he came on as a late substitute in a 1–0 home win over São Bernardo, for the year's Copa Paulista.

[3] He made his first team debut on 29 January 2021, replacing Igor Maduro in a 7–2 away routing of Figueirense, in the last round of the 2020 Série B.

[5] He scored his first professional goal on 13 March, netting the winner in a 1–0 Campeonato Paulista away success over Botafogo-SP; it was also the first start of his career.

[6] On 11 May 2022, after establishing himself as a regular starter, Léo Naldi further extended his link until July 2025.