|Date of birth||3 May 1999|
|Place of birth||La Plata, Argentina|
|Height||1.79 m (5 ft 10 1⁄2 in)|
* Senior club appearances and goals counted for the domestic league only and correct as of 23:17, 4 June 2019 (UTC)|
‡ National team caps and goals correct as of 23:17, 4 June 2019 (UTC)
Sosa's career began with Mercedes, before River Plate signed him in 2008. The 2018–19 campaign saw Sosa become a senior member of the club's first-team, he made his professional career debut in a 2018 Copa Libertadores fixture with Racing Club on 29 August 2018; he featured for the remaining sixteen minutes as River Plate won 3–0. He ended the aforementioned season with five total appearances.
Sosa, whilst with River Plate, represented the Argentina U20 team; including in training sessions with the seniors. In December 2018, Sosa was selected for the 2019 South American U-20 Championship. He also made the final squad for the subsequent 2019 FIFA U-20 World Cup. Sosa made four appearances in the latter tournament in Poland.
- As of 5 June 2019.
|River Plate||2018–19||Primera División||4||0||0||0||0||0||1[a]||0||0||0||5||0|
- Appearance(s) in the Copa Libertadores
- "Argentina - S. Sosa". Soccerway. Retrieved 22 September 2018.
- "Quién es Santiago Sosa, la nueva apuesta de Gallardo en River". Goal. 6 September 2018. Retrieved 22 September 2018.
- "Santiago Sosa tuvo su debut en River Plate". Noticias Mercedinas. 23 September 2018. Retrieved 22 September 2018.
- "Ficha Estadistica de SANTIAGO SOSA". BDFA. Retrieved 22 September 2018.
- "El pibe al que Gallardo hizo debutar con Racing". Olé. 30 August 2018. Retrieved 22 September 2018.
- "River Plate - Santiago Sosa". River Plate. Retrieved 22 September 2018.
- "Convocados para el Sudamericano Sub 20". AFA. 22 December 2018. Retrieved 2 January 2019.
- "Lista de convocados para el Mundial". AFA. Retrieved 4 May 2019.
- Santiago Sosa at Soccerway
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