It is all change for Jaguares again
Perez, who made seven changes to the team that started the game against Sunwolves last week, made another seven changes this week.
At lock Matías Alemanno will take the place of Marcos Kremer, while in loose forward changes will see Benjamín Macome and Juan Manuel Leguizamon come in for , Leonardo Senatore and Rodrigo Báez.
Having come off the bench for his first Jaguares match against the Sunwolves last week, Martin Landajo will start his first Super Rugby match for the men from Argentina.
Other backline changes will see Matías Moroni and Jerónimo De la Fuente come in as the new centre pairing in place of Santiago Gonzalez Iglesias and Matias Orlando.
On the wing Bautista Ezcurra replaces Emiliano Boffelli.
The changes do not stop with the starting XV - with Julian Montoya, Tomas Lavanini and Manuel Montero returning to the matchday XV after recovering from injury.
The Jaguares have won five of their 10 matches this season - four of those victories coming at home.
Their only home loss was against the Sharks.
It will be the first time the Western Force visit Argentina and only the second Australian team to visit the country. The first was Reds, who lost 8-22.
The Brumbies are next to visit Buenos Aires, when they arrive on May 27.
Jaguares: 15 Joaquin Tuculet, 14 Santiago Cordero, 13 Matias Moroni, 12 Jeronimo De La Fuente, 11 Bautista Ezcurra, 10 Juan Martin Hernández, 9 Martin Landajo, 8 Benjamin Macome, 7 Juan Manuel Leguizamon, 6 Tomas Lezana, 5 Matias Alemanno, 4 Guido Petti Pagadizaval, 3 Ramiro Herrera, 2 Agustin Creevy (captain), 1 Santiago Garcia Botta.
Replacements: 16 Julian Montoya, 17 Lucas Noguera Paz, 18 Felipe Arregui, 19 Tomas Lavanini, 20 Leonardo Senatore, 21 Gonzalo Bertranou, 22 Joaquin Diaz Bonilla, 23 Manuel Montero.
Date: Saturday, May 13
Venue: Vélez Sarsfield, Buenos Aires
Kick-off: 18.40 (21.40 GMT; 05.40 AWST, Sunday, May 14)
Referee: Ben O'Keeffe (New Zealand)
Assistant referees: Juan Sylvestre (Argentina), Jose Covasi (Argentina)
TMO: Santiago Borsani (Argentina)