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Riley O'Brien
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Batting / Throwing
Proj.
Injury Status
Est. Return 9/6/2025 (Shoulder)
Performance
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Sep 06 (GW47)
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Sep 06 (GW47)
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Sep 07 (GW47)
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Sep 09 (GW48)
MLB
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Jersey Number
#55Age
30Birthplace
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September 4, 2025
Could be available this weekend
The Cardinals are hopeful O'Brien (shoulder) will be available to pitch Friday against the Giants, the St. Louis Post-Dispatch reports.
Analysis
O'Brien hasn't pitched in a week due to lingering right shoulder soreness, but he played catch earlier this week and could be cleared for game action after the team's off day Thursday. The 30-year-old collected two saves and three holds in August and boasts a 1.69 ERA and 35:17 K:BB over 37.1 innings this season.
September 1, 2025
Plays catch, could avoid IL
O'Brien (shoulder) was cleared to play catch Monday and could avoid the 15-day injured list, Daniel Guerrero of the St. Louis Post-Dispatch reports.
Analysis
O'Brien underwent an MRI on Monday due to lingering right shoulder discomfort, but the Cardinals were encouraged by the imaging results and the reliever was allowed to resume throwing. While a stint on the IL has not been ruled out, O'Brien will be given a couple days to continue to recover to see if a long-term absence can be avoided. The 30-year-old has emerged as a late-inning bullpen arm for St. Louis this season, collecting a 1.69 ERA and 35:17 K:BB over 37.1 innings while notching two saves.
September 1, 2025
Shut down from throwing
O'Brien will be shut down from throwing after undergoing an MRI on his sore right shoulder Monday, John Denton of MLB.com reports.
Analysis
The Cardinals have yet to provide word on the results of the MRI, but a move to the 15-day injured list for O'Brien feels inevitable. O'Brien has been used as a high-leverage reliever for the Cardinals over the last couple months and picked up a pair of saves in August, but now his health status is murky. JoJo Romero is the favorite to close games for the Cardinals in September, with Kyle Leahy also in the mix.
August 31, 2025
Could require IL stint
O'Brien has dealt with fatigue in his right shoulder area in recent days and is set to be examined by a doctor Monday, Derrick Goold of the St. Louis Post-Dispatch reports.
Analysis
According to Goold, the Cardinals are weighing whether to place O'Brien on the injured list, and the results of his upcoming exam will likely be vital in that decision. With the active roster expanding to 28 players Monday, the Cardinals are likely to call up at least one pitcher from the minors, and the team could bring another relief arm aboard if O'Brien heads to the IL in a corresponding move. Since the beginning of June, O'Brien has performed as one of the Cardinals' top relievers, logging two wins, two saves and five holds while pitching to a 1.04 ERA and 1.07 WHIP over 34.2 innings.