After playing rugby in his late infancy he joined Club Atlético Banfield's youth system at the age of 12, and made his professional debut in 2006,[2] going on to establish as a key member of the first team; during the 2007–08 season, the Apertura and Clausura tournaments combined, he scored eight goals in 32 games as they ranked third in the former.

[3] At the end of the season he returned to Banfield, where he failed to reproduce his previous form, leaving for Santiago Wanderers of Chile on loan in early January 2011.

[7] He made his Super League Greece debut on 18 August, playing the full 90 minutes in a 3–3 home draw with PAS Giannina FC.

Barrales was linked to Standard Liège in April 2015,[8] after solid performances that eventually led him to be crowned league top scorer in the 2014–15 campaign with 17 goals, helping his team finish fourth.

[20] Barrales returned to the Greek top division in July 2018, signing with PAS Lamia 1964 from Club de Gimnasia y Esgrima La Plata.