Ramirez was outrighted to Triple-A Toledo on Thursday, Evan Woodbery of MLive.com reports.
Ramirez led the Tigers' relievers in innings pitched this season, but now finds himself off the 40-man roster and eligible for minor-league free agency after the World Series. In 79.2 innings pitched this season, the 30-year-old recorded a 4.07 ERA with a 74:35 K:BB.