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The Phillies announced that Miller will undergo a radiofrequency ablation of the facet joints in his back Friday and is expected to be sidelined 6-to-8 weeks, Paul Casella of MLB.com reports.
Miller might have pushed for a promotion to the majors by now had he been healthy and performing well at Lehigh Valley. However, he's been sidelined all season with nagging back problems, and a decision was made to have the minimally invasive procedure after he visited with multiple spine specialists. The top prospect will rest for one week before beginning the rehab process, and he could be ready to play for Triple-A Lehigh Valley as soon as late July.
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Phillies' Aidan Miller: Shut down again
Rotowire
Miller (back) is no longer doing any baseball activities, MLB.com reports.
Miller had resumed light baseball activities as of mid-May, but he's since been shut down altogether for the second time during his rehab. The 21-year-old top prospect has been on the shelf since February due to a balky lower back, and he just can't seem to get to the bottom of the issue. At this stage, it's unclear if Miller be able to get back onto the field at any point in June.
Miller (back) has resumed light baseball activities, Paul Casella of MLB.com reports.
Miller had been shut down from baseball activities for roughly the past two weeks, so it's encouraging to hear he's back to progressing in some capacity. The 21-year-old top prospect has been plagued by a lower-back injury since February, and his return to action still doesn't seem to be particularly close. The Phillies are likely to continue taking a cautious approach with Miller's recovery going forward.
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Phillies' Aidan Miller: Return not imminent
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Miller (back) is no longer doing baseball activities, MLB.com reports.
Miller was fielding ground balls in April but since appears to have been shut down. It's unclear if the 21-year-old top prosect has suffered a setback in his rehab from a nagging lower-back injury, or if the Phillies are being simply cautious with his recovery. In any event, Miller doesn't look to be close to making his season debut.
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Phillies' Aidan Miller: Still hasn't resumed batting
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Miller (back) is nearing a return to swinging a bat, Todd Zolecki of MLB.com reports.
Miller has been "doing everything except for swinging," according to Phillies manager Rob Thomson, including fielding ground balls. The team is hoping to get the 21-year-old back swinging a bat this week as he continues to work his way back from lower-back soreness, which has plagued him since February.
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Phillies' Aidan Miller: Not swinging bat yet after all
Rotowire
Miller (back) has yet to resume swinging a bat but has begun rotational exercises, Todd Zolecki of MLB.com reports.
A previous news item indicated that Miller had started to swing a bat, but the Phillies clarified that report in stating that it hasn't happened just yet. The top prospect is still rehabbing a back injury that dates back to last year, and it's unclear when he might be ready to suit up for Triple-A Lehigh Valley.
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Phillies' Aidan Miller: Resumes taking swings
Rotowire
Miller (back) has resumed swinging a bat, MLB.com reports.
Although it's an encouraging step forward for Miller, there remains no clear timetable for his return to game action for Triple A Lehigh Valley. The 21-year-old shortstop, who is Philadelphia's top prospect, has been nursing lower-back soreness since spring training and figures to be brought along slowly amid his recovery.
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Phillies' Aidan Miller: Not yet taking swings
Rotowire
Phillies manager Rob Thomson said Tuesday that Miller (back) has increased his rehab activities but is not yet swinging a bat, Todd Zolecki of MLB.com reports.
The nagging back injury has been bothering Miller going back to the fall, and his baseball activity is apparently still pretty limited as he's opened the campaign on Triple-A Lehigh Valley's injured list. Once cleared for all activities, the 21-year-old top prospect will need some time to build up to game readiness after missing all of spring training.
Phillies' Aidan Miller: Won't be ready for start of season
Rotowire
Miller (back) is unlikely to be ready for Opening Day at Triple-A Lehigh Valley, Charlotte Varnes of The Athletic reports.
The same back issue kept Miller from playing during the Arizona Fall League and most of spring training, and he looks like he'll be on the shelf indefinitely at Triple-A to start the season. Assuming he can eventually get healthy, Miller will have some rust to knock off, but he doesn't need much more minor-league seasoning before he's ready to help the big club.
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Phillies' Aidan Miller: Reassigned to minors camp
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The Phillies reassigned Miller (back) to minor-league camp Thursday, Lochlahn March of The Philadelphia Inquirer reports.
Miller has been held out of Grapefruit League play this spring due to a back issue, and it's unclear when he might be ready to play in a game. The top prospect has a good shot to debut at some point this season for the Phillies, but he'll need to get healthy first.
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Phillies' Aidan Miller: No timeline to resume hitting
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Phillies manager Rob Thomson said Wednesday that there's no timetable for when Miller (back) will resume swinging a bat, Lochlahn March of The Philadelphia Inquirer reports.
Miller has been receiving treatment for lower-back soreness and is ramping up his activity level in the weight room. However, with no timeline for when he'll be allowed to hit again, it sounds like it could be a while before we see the top prospect in Grapefruit League action. Miller entered camp as a long shot to make the Phillies' Opening Day roster, and the back injury makes it close to a foregone conclusion that he's ticketed for Triple-A Lehigh Valley to begin the campaign.
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Phillies' Aidan Miller: Dealing with back soreness
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Miller is battling lower-back soreness and will be receiving treatment during the week, Scott Lauber of The Philadelphia Inquirer reports.
It's not quite clear when this issue popped up for Miller, but the team is understandably proceeding with caution to ensure the injury doesn't get worse. The 21-year-old received an invitation to big-league camp and has an outside chance to make the Opening Day roster, but this injury won't help his chances. Miller can be considered day-to-day until the team has another update to share.
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Phillies' Aidan Miller: Nets invite to spring training
Rotowire
The Phillies have extended Miller an invitation to big-league camp during spring training.
It's the second straight year with a big-league camp invite for Miller, who slashed .264/.392/.433 with 14 home runs, 59 stolen bases and an 82:123 BB:K over 116 games between Double-A Reading and Triple-A Lehigh Valley in 2025. The 21-year-old has only played shortstop in pro ball and Trea Turner has that position locked down with the major-league club, so Miller is likely to return to Lehigh Valley to begin the 2026 season.
