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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
Rotowire
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
Rotowire
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.
Phillies' Aidan Miller: Pulls out of Arizona Fall League
Rotowire
Phillies farm director Luke Murton said that Miller will no longer participate in the Arizona Fall League due to "some nagging things physically," Scott Lauber of The Philadelphia Inquirer reports.
There doesn't seem to be any concern that whatever physical issues Miller is dealing with will linger, but the Phillies have decided it's best to give their top prospect some rest. Miller slashed .264/.392/.433 with 14 home runs and 59 stolen bases between Double-A Reading and Triple-A Lehigh Valley in 2025 and could be ready to make his major-league debut with Philadelphia next season.
The Phillies promoted Miller from Double-A Reading to Triple-A Lehigh Valley on Monday, Todd Zolecki of MLB.com reports.
After earning a pair of promotions in 2024, Miller had up to this point spent the entire 2025 season at Reading, slashing .259/.382/.427 with 13 home runs, 52 stolen bases and a 14.9 percent walk rate over 489 plate appearances. Miller had opened September by going 8-for-19 with two extra-base hits, two stolen bases and a 9:4 K:BB in six games, with his hot start to the month convincing the Phillies that he was ready for a stiffer test. Though Miller is likely to remain at the Triple-A level for the rest of the season, a call-up to the big leagues can't be completely discounted if the hamstring strain that star shortstop Trea Turner suffered in Sunday's loss to the Marlins proves to be a long-term concern. For now, Edmundo Sosa would appear to be the top choice to step in as the Phillies' everyday shortstop if Turner is forced to go on the injured list.
Miller is slashing .261/.400/.457 with three home runs and 16 steals in his last 25 games for Double-A Reading.
Miller was known more for his bat than his speed when the Phillies selected him in the first round a couple years ago, but he's been running wild this year for the Fightin Phils. He got off to a slow start at Double-A, but Miller has come on strong lately and is walking at an 18.3 percent clip over this 25-game stretch. Miller has only played shortstop since getting drafted, but there's a chance he will eventually move to third base.
The Phillies reassigned Miller to minor-league camp Tuesday, Todd Zolecki of MLB.com reports.
Miller was one of a handful of cuts the Phillies made as they trim down the number of bodies in big-league camp. The top prospect finished last season at Double-A Reading and is likely headed back there to start the 2025 campaign. Miller is tracking toward a potential debut in 2026.
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