The Liverpool man has pulled out of the game in New Jersey because he is set to become a father, but Rodrigo Brana has remained is fit after recovering from a thigh injury
Liverpool's Rodriguez took the decision to pull out of the squad for the game in the United States because his wife is expecting a child.
That freed up a space for Velez Sarsfield winger Fernandez, who has previously represented his country on two occasions.
It had initially been thought that the 26-year-old had been summoned to replace Rodrigo Brana, but the veteran defensive midfielder has recovered from a bruised right thigh and is available to face the Selecao.
Argentina's clash with arch-rivals Brazil is scheduled to get under way at the MetLife Stadium in East Rutherford, New Jersey at 21:00CET on June 9.