 Due to his good performances for Universidad de Chile, he was called up for the match against Ghana at PPL Park, in where he played well in a 1–1 draw.He started again the qualifiers against Bolivia and Venezuela, both 2–0 away victories, where Díaz excelled.Díaz started all six matches in the 2015 Copa América, helping Chile win in a penalty shootout against Argentina, to win their first major international honor.