The Cruzeiro playmaker is one of four Brazil-based players in the list for the return match of the Superclasico de las Americas following a goalless draw 10 days ago in Cordoba, Argentina.
Montillo told SporTV: "To be selected for the national team is a dream come true.
"Being called for a World Cup, the qualifiers or even a friendly match is an honour."
Alongside Montillo, Internacional trio Andres D'Alessandro, Pablo Guinazu and Mario Bolatti were called up.
Boca Juniors star Juan Roman Riquelme will miss this game due to a knee injury but five of his team-mates were included in the list - goalkeeper Agustin Orion, defender Clemente Rodriguez, midfielder Cristian Chavez and forwards Pablo Mouche and Lucas Viatri.
Argentina squad: Agustin Orion (Boca Juniors), Marcelo Barovero (Velez Sarsfield), Esteban Andrada (Lanus); Emiliano Papa, Sebastian Dominguez (both Velez Sarsfield), Christian Cellay, Leandro Desabato (both Estudiantes), Ivan Pillud (Racing Club), Jonathan Bottinelli (San Lorenzo), Clemente Rodriguez (Boca Juniors); Augusto Fernandez, Hector Canteros (both Velez Sarsfield), Agustin Pelletieri (Racing Club), Cristian Chavez (Boca Juniors), Pablo Guinazu, Andres D'Alessandro, Mario Bolatti (all Internacional of Brazil), Walter Montillo (Cruzeiro of Brazil); Gabriel Hauche (Racing Club), Pablo Mouche, Lucas Viatri (both Boca Juniors), Emanuel Gigliotti (San Lorenzo).