Pieretto suffered an ACL injury prior to the 2018 Super Rugby season that ruled him out of action for 6 to 7 months.
[1] Pieretto joined English club Exeter Chiefs in November 2019 for the remainder of the 2019–20 season,[2] and joined Scottish Pro14 club Glasgow Warriors on a two-year contract from the 2020–21 season.
[5] Having played rugby from a young age, Pieretto was selected for the Argentina under-19's team in 2013 to face neighbouring sides Uruguay U19, Chile U19 and Brazil U19.
[citation needed] In January 2016, Pieretto was called up to the senior side for the 2016 Americas Rugby Championship, where he made an appearance in 4 of the uncapped games.
[7] He made his international debut for the Pumas on 4 June 2016, starting against Chile in the 2016 Sudamérica Rugby Cup.