Iriarte was optioned to Triple-A El Paso by the Padres on Sunday.
Iriarte was added to the Padres' 40-man roster over the offseason and impressed during his time in big-league camp, yielding just one unearned run over three innings. The 22-year-old had seemed in contention for a roster spot, but the team needing to make some early cuts because of its March 20-21 series versus the Dodgers in South Korea probably didn't help Iriarte's bid. He's put himself in position for a promotion at some point this season, however.