Farmer was added to the Tigers' roster Friday as the 26th man for their doubleheader against the White Sox.
The move was reported Thursday, with Farmer starting Game 1 and Matt Boyd slated to work the evening contest. Farmer carries a 4.12 ERA and a 1.31 WHIP with a 54:10 K:BB in 54.2 innings for Triple-A Toledo. He'll likely return there not long after he makes this appearance.