Valenti was produced by the academy of Primera División side Lanús.[3] He was an unused substitute on three occasions in the 2018–19 campaign for fixtures with Atlético Tucumán, Banfield and Godoy Cruz.[2][4] His professional debut arrived at the conclusion of the aforementioned season in the Copa de la Superliga, with Luis Zubeldía selecting Valenti to start and finish a round of sixteen match against Vélez Sarsfield.[2][5][6] On 27 July 2019, Valenti scored on his Primera División bow as he netted in a 1–1 draw with Gimnasia y Esgrima.[2] In total, Valenti made twenty-eight appearances and scored three goals in his first full season with Lanús.[2]
On 26 September 2020, Italian Serie A side Parma announced the loan arrival of Valenti; with an obligation to buy in June 2021, as the centre-back penned a four-year contract.[7][8] He made his debut in a Coppa Italia third round victory over Pescara on 28 October, after replacing Riccardo Gagliolo off the bench with eighteen minutes remaining.[2] His Serie A bow arrived on 22 December during a defeat to bottom of the table Crotone.[2] In 2024 he is promoted to Serie A with his team.