The Diamondbacks outrighted Guillorme to Triple-A Reno on Monday.
Guillorme was designated for assignment Friday and will head to the minors after failing to draw interest on waivers. The 29-year-old has slashed .205/.301/.273 with 10 RBI, four stolen bases and 14 runs scored over 79 games across stops with Arizona, Atlanta and the Angels so far in 2024.