[5] After impressing with the side in the year's Campeonato Paulista Segunda Divisão, he was announced at Comercial-SP on 16 January 2018.
[9] He made his professional – and Primera División – debut on 7 March 2020, coming on as a second-half substitute for Leandro Suhr in a 1–1 home draw against Fénix.
Leonai became a regular starter for the Patas Blancas, and scored his first professional goal on 28 June 2021, netting the opener in a 1–1 home draw against Cerro Largo.
[10] At the end of that season, he was chosen as the best foreign player of the tournament by Referí, the football section of newspaper El Observador.
[11] On 10 January 2022, Ecuadorian Serie A side Barcelona SC announced that Leonai had joined the club on a one-year loan deal, with a buyout clause.