Hernandez was selected before an injury saw him withdraw from the Pumas' squad ahead of their 13-6 loss to the Springboks in Pretoria in their opening game of the tournament.
But he returns to inside centre, replacing Santiago Gonzalez Iglesias.
The only other change made by coach Daniel Hourcade is Lucas Gonzalez Amorosino replacing Horacio Agulla on the wing.
Iglesias drops out of the squad, while Agulla moves onto the bench.
Argentina: 15. Joaquin Tuculet, 14. Lucas Gonzalez Amorosino, 13. Marcelo Bosch, 12. Juan Martin Hernandez, 11. Manuel Montero, 10. Nicolas Sanchez, 9. Martin Landajo, 8. Juan Manuel Leguizamon, 7. Juan Martin Fernandez Lobbe, 6. Paul Matera, 5. Tomas Lavanini, 4. Mariano Galarza, 3. Ramiro Herrera, 2. Agustin Creevy, 1. Marcos Ayerza
Replacements: 16. Matias Cortese, 17. Bruno Postiglioni, 18. Nahuel Tetaz Chaparro, 19. Matias Alemanno, 20. Leonardo Senatore, 21. Thomas Cubelli, 22. Jerome De la Fuente, 23. Horacio Agulla
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