Bowlan was diagnosed with a mild right groin strain Friday, Todd Zolecki of MLB.com reports.
Although Bowlan was diagnosed with a strain, the Phillies will hold off on placing him on the IL because they believe he will be able to return before the end of the season. When healthy, the 29-year-old has been one of the most reliable members of Philadelphia's bullpen, posting a 3.36 ERA and 1.03 WHIP across 56.1 innings.