Agustín Sienra

Agustín Sienra (born 14 July 1999) is an Argentine professional footballer who plays as a centre-back for Spanish club CD Castellón.

Career Sienra started off his career with Defensores Santa Catalina, before later signing with Newell's Old Boys. In 2016, following a trial, Sienra joined the youth system of Defensa y Justicia. It was in the latter month that the centre-back made his senior debut, as he featured for seventy-nine minutes of a domestic defeat to Central Córdoba on 29 November. On 5 January 2023, he moved to San Martín de San Juan also in a temporary deal.

Sienra helped San Martín to achieve promotion to the top tier in 2024, before returning to Defensa for the 2025 season. On 7 July of that year, after just three further first team appearances, he moved abroad and signed a one-year deal with Spanish Segunda División side Castellón.

Career statistics .