Pumas captain, Agustín Creevy, has become the first player based outside of Argentina to commit to the country's Super Rugby franchise which will join the competition next year.
Creevy, 30, currently plays for Worcester in the United Kingdom but has signalled his intention to return home and play for the new franchise, bringing the number of contracted players to 21.
Making the announcement via videoconference on Monday, Creevy said, "It makes me very happy to confirm this agreement with the UAR. It's a big step. I have played for Argentina from a young age and was always proud to defend the Argentina shirt. I never hesitated to go back home.
"This is a very important year. The World Cup is the main aim for this 2015, but then comes the moment to join Super Rugby which is a historic dream for everyone."
UAR President, Carols Araujo added, "This is another historic day for Argentine rugby.
"Agustín, the captain of the national team, has been a critical part of a process that has been underway for years, and will have its culminating point next year with the inclusion of an Argentinean franchise in Super Rugby.
"For these reasons, it is especially important to be the first player to play in Europe to demonstrate through this contract commitment to Argentine rugby."
Creevy has been playing in Europe since turning professional in 2007, representing Biarritz (2007-10), Clermont (2010-11), Montpellier (2011-13) and Worcester, in which 2014 will be his final season before coming to Super Rugby.