PHILADELPHIA -- The conversation around Aidan Miller has shifted slightly over the last 48 hours — not because expectations for the Phillies’ top infield prospect have changed, but because the organization is being careful with one of the most important young players in its system.
Miller, the Phillies’ 2023 first-round pick and widely viewed as one of the organization’s cornerstone prospects, has been limited in camp by a lingering lower-back issue that has slowed his spring progression.
The 21-year-old infielder has yet to appear in a Grapefruit League game this spring as the club continues to monitor the injury. Miller said the discomfort began when he woke up with a “super tight” back during camp, and the feeling lingered even after treatment.
Phillies president of baseball operations Dave Dombrowski acknowledged the setback recently, noting that the team initially believed Miller had made progress before the issue resurfaced.
“We felt he was making good progress coming into Spring Training,” Dombrowski said, adding that the club is still working to determine exactly what caused the setback.
The organization’s cautious approach reflects Miller’s growing importance to the franchise.
Despite being only 21, he has rapidly climbed the Phillies’ minor-league ladder and is widely considered one of the top prospects in the system and among the better young infielders in baseball.
Last season provided a glimpse of why the excitement is so strong.
Miller split the year between Double-A Reading and Triple-A Lehigh Valley, finishing with a .264/.392/.433 slash line, 14 home runs and an eye-opening 59 stolen bases across 116 games.
The most impressive stretch came late in the year. After an uneven first half, Miller caught fire in August and September, posting OPS marks over 1.000 during parts of that run while forcing a promotion to Triple-A.
That surge reinforced what scouts have believed since the Phillies selected him in the first round of the 2023 draft: Miller has the potential to become a middle-of-the-order infielder capable of hitting for power while also impacting the game on the bases.
His defensive future remains flexible. The Phillies have experimented with Miller at shortstop, third base and even second base in an effort to maximize his versatility, particularly with Trea Turner entrenched at shortstop in the majors.
Because of that positional flexibility — and his rapidly improving offensive profile — Miller is widely viewed as one of the players who could help extend the Phillies’ current competitive window.
For now, however, the focus is simply getting him healthy.
The back issue also limited Miller late last season and kept him out of the Arizona Fall League, making the organization particularly cautious about rushing him back into action.
Even with the delayed spring, Miller was never expected to break camp with the major-league club. The more realistic timeline has always pointed toward additional development time in the minors before a potential major-league debut sometime in the next year or two.
In the Phillies’ long-term plans, though, Miller remains central.
If his development continues on the trajectory it showed late last season, the young infielder still projects as one of the players most likely to become the next homegrown cornerstone in Philadelphia.
Loading Phillies schedule...
Loading NL East standings...
Support the Mission. Fuel the Movement.
You’re not just funding journalism — you’re backing the future of youth baseball in Philly.
👉 Join us on Patreon »