Hearn won't be a member of the Rangers' Opening Day roster, T.R. Sullivan of MLB.com reports.
The 25-year-old had hope of beginning the season as the Rangers' top left-handed reliever since Joely Rodriguez (lat) and Brett Martin (illness) have been unavailable, but he'll end up reporting to the team's alternate training site. Hearn has traditionally been a starter in the minors and missed most of 2019 with an elbow injury.