|Photo ESPN Scrum|
Aged just 19 Petti made his international debut for Argentina in November 2014 against Italy in Genoa. He was selected both with an eye to the future and based on the needs of the team at the time. Missing to injury were Mariano Galarza and Matías Alemanno while Daniel Hourcade decided against selecting Manuel Carizza of the Stormers and had ruled out the possibility of a return for Particio Albacete of Toulouse.
Petti thus partnered Tomás Lavanini against both Italy and France in November in what were two victories for the number one rugby nation from the Western Hemisphere. Petti was substituted in both matches by another PladAR player, Lucas Ponce in the final quarter. Ponce is one of a number in consideration for international duty in 2014 and a professional future with the Argentina Suepr rugby franchise.
The selection of Petti by Daniel Hourcade completed the progression of the SIC forward through the juniors to senior level. Petti represented his country at under 18, under 19 and under 20 levels playing a total of eleven matches against countries including Australia, Chile, France, Scotland, South Africa, Uruguay, the USA and Wales. He appeared at the Junior World Championship.