Farmer was optioned to Triple-A Toledo on Sunday.
Though Farmer struck out a career-high 11 batters over 6.1 scoreless innings during his spot start in the second game of Saturday's doubleheader with the White Sox, it was always expected that he would return to the minors after the outing. If nothing else, Farmer's dazzling performance likely solidified his case for being first in line to join the Tigers rotation if the team should lose a starter to injury at any point.