Juan Martin Hernandez has become the latest Argentine player to sign for the new Super Rugby franchise, joining on a two-year deal.
The veteran playmaker arrives having previously spent most of his club career in France, with a short injury-hampered spell in South Africa with the Sharks.
However with an Argentine franchise joining Super Rugby from next season, Hernandez has imitated the likes of skipper Agustin Creevy and the majority of los Pumas' younger internationals in signing for the franchise.
El Mago, who is currently preparing for his third Rugby World Cup, explained that it was an easy decision.
"I didn't even have to think about it. I was convinced that I wanted to be part of what is coming," he said.
"Since the offer arrived, I haven't even thought about it, I had no doubts. It all went quite quickly.
"Our team will play in the way it knows how. This tournament, which is new for us, will help the team to mature and build confidence.
"We'll come up against a higher intensity, with games home and away, much more than in the Rugby Championship, and it will be great to see how far it can take Argentine players."
The president of the UAR, Carlos Araujo added: "It's one of the most important pieces of news we wanted to deliver and for that reason this is a happy moment for everyone.
"We're really pleased at the UAR to be able to bring one of the most talismanic players of recent years back to Argentina and into our first franchise, at his peak.
"Juan Martin emigrated to play professional rugby in 2003 and gave a lot to this sport during his successful career. It's a proud moment for me, as president of this organisation, to sign this contract in the name of the council with a star of world rugby."