Aidan Miller Pauses Light Baseball Work to Resume Rehab for Recurring Back Discomfort

Overview

• Phillies general manager Preston Mattingly said Sunday that Miller has stopped the light baseball activities he began May 19 and returned to a structured rehab program at the team’s Clearwater training complex.
• Miller has thrown, played catch, taken ground balls and done conditioning this year but has not swung a bat in any team activity during the 2026 season.
• The club has not announced a new diagnosis beyond the lower-back discomfort first listed by Triple-A Lehigh Valley in March and is deferring decisions about ramping up activity to the medical staff.
• Team officials express cautious optimism that Miller could appear in a game this season, but they offered no timeline and described the move back to rehab as routine medical checkpoints rather than a specific setback.
• Miller is a 21-year-old shortstop and the Phillies’ 2023 first-round pick who hit .264/.392/.433 across Double-A and Triple-A in 2025, and the club’s conservative approach seeks to protect his long-term health while delaying any near-term promotion or roster help.