An MRI on Saturday revealed Pomeranz is dealing with a left forearm flexor strain, Sean McAdam of BostonSportsJournal.com reports.
Pomeranz suffered the injury during Friday's Grapefruit League game against the Cardinals. The encouraging news is that the strain is being deemed "mild" and the southpaw doesn't seem particularly worried about the diagnosis. "I'm not worried. I feel a lot better today," Pomeranz said Saturday. It's still unclear how long the issue will keep him sidelined at this point -- he missed 10 days to open the 2017 season with a similar issue -- but a timetable will likely emerge in the next couple days.