De la Fuente made his senior international debut in 2014.[1] His first appearance for Los Pumas came on 17 May 2014 against Uruguay, he followed that up a week later with a try on his second international appearance against Chile. He was then selected in the Pumas squad for the 2014 mid-year rugby union internationals in which he appeared twice in losses to Ireland, but was left out for their final match against Scotland.[1] Despite this he was named in the 30-man squad for the 2014 Rugby Championship.[5] He was not initially selected for the Pumas opening match against the Springboks, however a late injury to Juan Martín Hernández saw De la Fuente promoted to the replacements bench and he made his championship debut as a second-half substitute in a 6-13 loss.[6]