Los Pumas head coach Mario Ledesma has included yet another overseas-based player ahead of his side's final two Rugby Championship matches against New Zealand and Australia.
Stade Francais tighthead prop has been recalled into the squad having last featured for the side against New Zealand last year.
Ledesma's 37 man squad also includes three uncapped players in Lucas Paulos (played with Los Pumitas the U20 world championships this year), Matías Osadczuk and Rodrigo Bruni.
Leonardo Senatore and Enrique Pieretto are also available for selection following their injury concerns.
Herrara is the fourth overseas-based player to be added to the squad by Mario Ledesma after Juan Figallo, Gaston Cortes and Facundo Bosch.
Argentina's 37 man squad for the final two rounds of the Rugby Championship