Kelly left Tuesday's game for Triple-A Pawtucket with a right groin injury, the Providence Journal's Bill Koch reports.
Kelly has been working on some mechanical adjustments with the Red Sox Triple-A affiliate, but may be sidelined for a spell after suffering a groin injury Tuesday. The Red Sox are waiting for a fifth starter to emerge as the season goes on, with Kelly hoping to be that guy if he could make some tweaks in the minors. His status will be updated when more details about the injury are released.