On 27 May, uncapped Casco was selected by coach Gerardo Martino for the 2015 Copa América in Chile. He made his debut in a preparation friendly on 7 June at the Estadio San Juan del Bicentenario, filling in for Facundo Roncaglia for the final 29 minutes of a 5–0 win over Bolivia; however, he did not feature in the tournament, in which his country lost to the hosts in the final.