Harris was recalled by the Athletics on Friday.
The 26-year-old lefty has yet to appear in a big-league game. Harris has made 10 starts in Triple-A since 2022 and holds a 6.34 ERA and 1.84 WHIP across 32.2 innings in that time. Adam Oller was optioned to Triple-A Las Vegas in a corresponding move, so Harris will most likely take Oller's spot in the bullpen as a multi-inning reliever.