O'Brien (forearm) will begin a rehab assignment with Triple-A Memphis on Friday, John Denton of MLB.com reports.
O'Brien has been shelved since Opening Day due to a strained forearm but has finally been cleared for a rehab stint The 29-year-old has completed three live batting practice sessions and could rejoin the Cardinals' bullpen before the end of July.
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Cardinals' Riley O'Brien: Recalled from Triple-A
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Cardinals' Riley O'Brien: Could begin rehab assignment soon
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Cardinals' Riley O'Brien: Set for another live session
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Cardinals' Riley O'Brien: Rehab assignment pending
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