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|Full name||Franco Sebastián Sosa|
|Date of birth||April 4, 1981|
|Place of birth||Monteros, Argentina|
|Height||175 cm (5 ft 9 in)|
|2001–2006||Gimnasia de Jujuy||129||(7)|
|2013–2014||Gimnasia de Jujuy||14||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 24 May 2015.
Born in Monteros, Tucumán Province, Sosa started his playing career in 2001 with Gimnasia y Esgrima de Jujuy of the Argentine 2nd division. He was part of the team that won the Clausura 2005 and obtained promotion to the Argentine Primera. Sosa played for Gimnasia until the end of 2006, making over 100 appearances for the club, 43 in the Primera.
During the January 2006 transfer window Sosa joined Racing Club, quickly establishing himself as a key member of their defence, making appearances in 33 of the clubs 38 matches in 2007.
He played for the FC Lorient (French Premier League) during the 2009–2010 season. He signed a 3-year contract, on 22 July 2009.
On 2011, he returned to Argentina to play with Boca Juniors.
|Clausura 2005||Gimnasia y Esgrima de Jujuy||Primera B Nacional|
|Apertura 2011||Boca Juniors||Primera División|
|Copa Argentina 2012||Boca Juniors||Copa Argentina|
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