Pennington (elbow) remains in extended spring training as he recovers from surgery to remove bone chips from his elbow, Tom Haudricourt of the Milwaukee Journal Sentinel reports.
The soon-to-be 22-year-old has yet to appear in a game at any level this season following the elbow procedure in December. The organization has not released a firm timetable, but assuming he doesn't suffer a setback, Pennington will likely report to Low-A Wisconsin or High-A Carolina sometime in the next few weeks, where he'll continue his development as a starter.