Flaherty (ankle) will begin a rehab assignment with Double-A Erie on Tuesday, Cody Stavenhagen of The Athletic reports.
Flaherty landed on the 15-day injured list a little over a week ago with a left peroneal strain, but he's been cleared for games after throwing a successful bullpen session over the weekend. The right-hander could require just the one rehab outing before rejoining the Detroit rotation. Flaherty has collected a 5.35 ERA and 78:34 K:BB over 65.2 innings covering 15 starts this season.