Jared Koenig will attempt to rehab the injury and avoid surgery, with an expected return in two to four weeks. The left-hander had been pitching with decreased velocity this season, averaging 93.5 mph on his sinker in his last outing.
Shane Drohan was called up to replace Koenig and may make his MLB debut against the Red Sox, the team that traded him this offseason. The 27-year-old is likely to pitch on April 8, potentially starting the series finale or providing long relief earlier in the series.