Pumas coach Santiago Phelan has unveiled his 30-man player list to play in New Zealand and confirmed Hernandez will not be there.
Hernandez suffered his injury in March, playing for French club side Racing Metro against Bourgoin.
He underwent surgery and began an intensive rehabilitation process in the hope of recovering in time for the World Cup.
Phelan cut nine other players from his provisional squad: Agustin Figuerola, Genaro Fessia, Lucas Borges, Martin Bustos Moyano, Eusebio Guinazu, Rafael Carballo, Santiago Guzman, Andres Bordoy and Gabriel Ascarate.
Bordoy and Ascarate will travel with the squad for their warm-up Test against Wales in Cardiff on August 20, to provide back-up in case of injuries.
Argentina World Cup squad: Horacio Agulla, Patricio Albacete, Marcos Ayerza, Marcelo Bosh, Maximiliano Bustos, Gonzalo Camacho, Alejandro Campos, Manuel Carizza, Felipe Contepomi, Agustin Creevy, Julio Farias Cabello, Juan Fernandez Lobbe, Santiago Fernandez, Juan Figallo, Mariano Galarza, Alvaro Galindo, Lucas Gonzalez Ambrosio, Agustin Gosio, Juan Imhoff, Alfredo Lalanne, Mario Ledesma, Juan Manuel Leguizamon, Martin Rodriguez, Rodrigo Roncero, Federico Sanchez, Martin Scelzo, Leonardo Senatore, Gonzalo Tiesi, Tomas Vallejos, Nicolas Vergallo.
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
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