Isa turned heads in the 2013 Junior World Championship with a series of strong performances. His form continued with his club team Toulon where the 19 year old was awarded his first cap against Bordeaux-Begles in the clubs 2013 pre-season friendlies. He continued to impress on the international stage with his bone crunching tackles and strong ball carrying attributes and was selected for the Los Pumas Squad to represent Argentina in the 2015 RWC.
Isa went on to become a regular part of the Argentina nation team following his return back to Argentina. He went on to represent the Jaguares in their maiden Super Rugby season in 2016 and in February 2017 he signed a deal with French side Toulon that would see him return to France at the end of the Super Rugby season. Isa has agreed to join Lyon until the end of the 2016/17 as a medical joker and will join up with Toulon at the end of the season.
As of the 2018/2019 Champions Cup, Isa has had 6 Champions Cup appearances.
|2013 - present|
|2017 - present|
|2014 - 2017|
|2015 - 2017|
|2017 - 2017|