Agustín Sienra (born 14 July 1999) is an Argentine professional footballer who plays as a centre-back for Defensa y Justicia.
[3] Sienra started off his career with Defensores Santa Catalina, before later signing with Newell's Old Boys.
[4][5][6] In 2016, following a trial, Sienra joined the youth system of Defensa y Justicia.
[5][2] He made the move into first-team football towards the back end of 2020, appearing as an unused substitute for Copa Libertadores matches with Delfín (twice) and Olimpia and a Copa de la Liga Profesional encounter with Colón between September and November.
[3][7] 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.