 He started his first match against Chile, on 18 April 2007.His first goal with the "Albiceleste" arrived on 23 January 2010, in a 3–2 win in a friendly match against Costa Rica, scoring the opening goal of the game with a header on 10 minutes.Sosa was not called to the World Cup 2010 team by then-manager Diego Maradona, but was reinstated by new coach Alejandro Sabella for the World Cup 2014 qualifiers, and has been featured in several games since 2011.

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