The Athletics optioned Harris to Triple-A Las Vegas on Sunday.
Harris will head back to the Pacific Coast League for further refinement after the 26-year-old struggled in his first exposure to the level late in the 2022 season. The lefty earned the promotion to Triple-A after accruing a 1.67 ERA while striking out 48 over 32.1 innings at Double-A Midland, but he was lit up to the tune of a 6.35 ERA and 1.71 WHIP across his eight starts with Las Vegas.