Career
He is a physically strong athlete with excellent technique. Barrientos began his career at Racing Club in the Primera Division Argentina in 2003. In 2004 he played 6 months in the Regionalised Torneo Argentino Bachelor of Argentine football for Textil Mandiyú.
In 2005 he was released by Racing Club and he moved to France.
In 2005 he began his new life in French Ligue 2 club Football Club Lorient with high expectations. At the end of the 2005-2006 season the club were promoted to Ligue 1 and Barrientos saw his return to top level football.
After the his time in the Greek championship, Juan Manuel got married on the 20th of June 2008.