The 21-year-old Jaguares back was one of three uncapped players named in the Pumas matchday squad along with flanker Santiago Grondona and fellow centre Lucio Cinti, who could make their debuts off the bench.
Chocobares will line up with Matias Orlando in midfield at Western Sydney Stadium ooutside the experienced halfback pairing of scrumhalf Tomas Cubelli and flyhalf Nicolas Sanchez.
"It is a good opportunity to see how Santiago reacts," Ledesma told reporters on Thursday.