As a result, the organization announced on Sept. 7 that the infielder was being promoted to Triple-A with the Lehigh Valley IronPigs. The Phillies promoted Aidan Miller to the Lehigh Valley IronPigs after a torrid August in Double-AMiller had his best month of the season as a hitter in August for Reading. NEWS: Aidan Miller has been promoted to AAA Lehigh Valley, according to @_chaseford of @milb_central. Miller has the opportunity to continue his successful offensive stretch and help propel Lehigh Valley to the playoffs. However, it is a good sign in his development that he has been promoted to Lehigh Valley.