José Ernesto Sosa (born 19 June 1985) is an Argentine professional footballer who plays as a midfielder for Argentina Primera Division club Estudiantes de La Plata.

The highlight of his tenure with Estudiantes was being a key piece in the 7–0 defeat of derby rivals Gimnasia on 15 October 2006, and then his role in helping the team win their first league title since 1983 by scoring the equalizing goal from a free kick against Boca Juniors in the 2006 Apertura final playoff game.

[5][6][7] For his tenure with Metalist, Sosa adopted the number 11 jersey honoring his admired ex-teammate Juan Sebastián Verón, and has been instrumental in the team's successful Europa League campaign.

[8] With the Spaniards, he won the Spanish Liga and played in the 2014 UEFA Champions League Final against Real Madrid, coming on as a substitute, as Atlético lost 4–1 after extra time.

Following Riccardo Montolivo's long-term injury sustained in October 2016, Sosa assumed the role of a deep-lying playmaker, alternatively known as regista, operating in front of the team's defense line in 4–3–3 formation.

[16] On 8 September 2017, Sosa moved back to Turkey, joining Süper Lig club Trabzonspor on loan with an option to make the deal permanent until 2020.