Farmer was placed on the 10-day injured list with a left groin strain Monday.
Farmer bounced back Sunday following a rough appearance Friday, but he apparently didn't escape unscathed as he'll spend some time on the shelf. It's unclear how long he'll spend on the injured list, but Gregory Soto could step into more of a setup role in Detroit in Farmer's absence. Right-hander Beau Burrows was recalled by the Tigers in a corresponding move.