Argentinian fly-half/scrum-half Nazareno Valentini played in Major League Rugby between 2023-2024. He represented the Dallas Jackals for his entire MLR career.

Valentini has represented the Rosario U18 & U20 sides, and was the captain of the Old Resian club in the Argentinian Torneo del Litoral before making the move north to the USA. Valentini signed for the Dallas Jackals ahead of the 2023 MLR season, earning 6 appearances (all starts) and racking up 43 successful tackles and over 100m gained with ball in hand.

On 2nd January 2024, the Dallas Jackals announced the return of Nazareno Valentini for the 2024 MLR season.