Born in
Rosario,
Santa Fe Province to a
Paraguayan mother, Sarmiento began his career in Argentina with
Estudiantes de La Plata, signing for
La Liga side
Racing de Santander in July 2007. A complicated transfer situation between both clubs, which involved the
Court of Arbitration for Sport's mediation, meant that the 17-year-old spent the entire
2007–08 season without making a single first-team appearance. For the
2008–09 campaign, Sarmiento was loaned to
Xerez CD of
Segunda División, first appearing officially in a 1–1 home draw against
Real Murcia CF on 3 September 2008 in the
second round of the
Copa del Rey. Although not an undisputed starter, he did feature significantly as the
Andalusians achieved a first-ever top flight promotion, earning the nickname
Currito de Jerez by their fans in the process. On 31 August 2009, Sarmiento went on another
season-long loan, yet in the second division, now with
Girona FC. He made his first appearance on 3 October in a 2–2 draw with
SD Huesca, scoring his team's second goal, but was released by the
Catalans in late January 2010 for disciplinary issues, subsequently training with former club Santander to stay fit. Sarmiento spent
2010–11 with
UD Salamanca, again on loan and in the Spanish second tier. He netted for the first time in the league on 15 January 2011, but in 2–3 home loss to
FC Barcelona B. On 1 March he scored the game's only goal at home against
Villarreal CF B, helping the
Castile and León side to their first win in three months. Sarmiento then returned to the
Argentine Primera División, where he represented in quick succession
Racing Club de Avellaneda,
Arsenal de Sarandí and
All Boys. Following a very brief spell in Brazil with
Associação Atlética Ponte Preta, he went back to his country with
Quilmes Atlético Club. On 21 January 2015, Sarmiento joined
Peruvian Primera División's
Real Garcilaso. During his one-year spell in
Cusco, he played 39 matches in all competitions and scored eight times; additionally, he bought a bar in the city. Back in Argentina, Sarmiento appeared for
Club Atlético Banfield and
Newell's Old Boys. During his stint at the latter, marred by injuries, he was often more talked about for his behaviour off the pitch. In June 2019, Sarmiento signed for Greek club
Volos FC. In September, after only eight minutes of action in the
Super League, his contract was terminated by mutual consent, and he returned to All Boys shortly after on a one-and-a-half-year deal. Sarmiento retired aged 32, his last two teams being
Club Aurora (
Bolivian Primera División) and
Club Atlético San Miguel (Argentine
Primera B Metropolitana). ==International career==