Toulon lure Isa away from Argentina
The transfer will take effect at the end of the 2017 Super Rugby season.
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The 23-year-old, who has 25 caps, played one match for the triple European champions in the 2013/2014 season before heading back to Argentina.
Isa is the club's sixth new signing for next season – after wings Chris Ashton and Filipo Nakosi, fullback Hugo Bonneval, centre Semi Radradra and back row forward Raphael Lakafia.
Agence France-Presse