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Phillies Prospect Aidan Miller’s Spring Availability in Doubt With Recurring Back Issue

Team officials say the undiagnosed recurrence is prompting a cautious spring plan.

Overview

  • On Feb. 28 in Clearwater, Miller was limited to light tosses at BayCare Ballpark and has not resumed full baseball activities.
  • Phillies president Dave Dombrowski said Miller had a setback in camp and that “nobody knows exactly” what caused the problem.
  • The team has not committed to Grapefruit League action for Miller or to readiness for Triple-A Lehigh Valley’s March 27 opener.
  • Dombrowski said he cannot label the issue as chronic, noting some progress and expressing hope he could be ready for the beginning of the season.
  • Miller missed the end of the 2025 Triple-A season and the Arizona Fall League with similar back soreness and enters 2026 ranked No. 23 by MLB Pipeline and No. 2 in the Phillies system.