Johnson (shoulder) was reinstated from the 10-day disabled list and sent to Triple-A Pawtucket, Tim Britton of The Providence Journal reports.
Johnson tossed three innings of lackluster ball in a rehab start with the PawSox, and although the Red Sox recognized his clean bill of health, there's no room for him in Boston's rotation at this time. It wouldn't be too surprising to see him back in the big leagues after the All-Star break if Eduardo Rodriguez (knee) experiences any setbacks in his recovery, but for now, Johnson will continue to dwell in the minors and develop further as a starter.