Hernandez at pivot for Pumas
In total Argentina coach Daniel Hourcade has made 11 personnel changes his team for their Pool C match against Namibia at Leicester City Stadium.
Lock Guido Petti, blindside flank Pablo Matera, scrumhalf Martin Landajo and Matias Moroni are the only players to retain their places from the 45-16 win over Tonga. Moroni switches from outside centre to left wing.
At an average age of 26 years and 46 days old, Argentina's starting XV is the youngest they have selected at a World Cup for 16 years. The last time they selected a younger team at a World Cup was in their 32-16 pool defeat of Samoa in 1999.
Argentina's team has 349 caps which makes it their most inexperienced at a World Cup since the same match 16 years ago when the run-on team had 348 caps.
Despite that two of the starters, Hernandez and Horacio Agulla, played in Argentina's bronze final win against France at World Cup 2007. They account for 115 caps in the line-up against Namibia, nearly one third of Argentina's total.
This match will be only the third since 2012 in which Hernandez has started at flyhalf. He started there against South Africa in Argentina's 37-25 win in August and in his team's 20-18 win in Italy in November 2014.
Left wing Agulla had started 11 of Argentina's 12 matches at the last two World Cups but this will be his first time in the starting XV here.
Scrumhalf Martin Landajo will captain Argentina for the sixth time. He has three wins against South American opposition and two defeats against Ireland when leading out Argentina.
Centre Juan Pablo Socino will appear for the first time at this World Cup and all of Argentina's squad will have played at least once after this match.
Argentina: 15 Lucas Gonzalez Amorosino, 14 Matias Moroni, 13 Santiago Gonzalez Iglesias, 12 Juan Pablo Socino, 11 Horacio Agulla, 10 Juan Martin Hernandez, 9 Martin Landajo (captain), 8 Facundo Isa, 7 Javier Ortega Desio, 6 Pablo Matera, 5 Matias Alemanno, 4 Guido Petti, 3 Juan Pablo Orlandi, 2 Julian Montoya, 1 Lucas Noguera.
Replacements: 16 Agustin Creevy, 17 Marcos Ayerza, 18 Ramiro Herrera, 19 Leonardo Senatore, 20 Juan Martin Fernandez Lobbe, 21 Tomas Cubelli, 22 Marcelo Bosch, 23 Juan Imhoff.
Date: Sunday, October 11
Venue: Leicester City Stadium, Leicester
Kick-off: 12.00 (11.00 GMT; 08.00 ART, 13.00 Namibian time)
Referee: Pascal Gauzère (France)
Assistant referees: Jérôme Garcès (France), Mike Fraser (New Zealand)
TMO: George Ayoub (Australia)
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