Pirez, 24, is a native of Buenos Aires who made 38 appearances for River Plate from 2011-15. He joined Tigre in 2015-16, making 30 appearances, before signing with Estudiantes, where he made 15 appearances in 2016.
Pirez joins a defensive group that includes centerbacks Michael Parkhurst, Zach Loyd and Miles Robinson, who the team picked second in the recent SuperDraft, and fullbacks Mikey Ambrose, Mark Bloom, Tyrone Mears and Greg Garza. Jeff Larentowicz and Chris McCann also have some experience playing in the backline.
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