[2][4] He made the breakthrough into the club's first-team in 2020, initially appearing in pre-season under manager Luis Zubeldía; notably participating in a friendly against Vélez Sarsfield in October.

[7] In April 2022, Lomónaco joined Campeonato Brasileiro Série A side Red Bull Bragantino on a five-year deal.

On 19 April 2023, Lomónaco was separated from Bragantino's first team squad, after having his name included in the 2023 Brazilian football match-fixing scandal.

[9] On 28 July 2023, Bragantino sent Lomónaco on a season-long loan to Argentine Primera División side Tigre, with a future option to make the move permanent.

[10] In May 2023, Lomónaco admitted to receiving BR$ 30,000 in bribes for getting a yellow card during a Campeonato Brasileiro Série A match against América Mineiro.