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O'Brien (forearm) has been playing long toss as he continues a throwing progression, Daniel Guerrero of the St. Louis Post-Dispatch reports.

O'Brien is working his way back from a right flexor strain. He was shifted to the 60-day injured list last week, so the right-hander won't be eligible for activation until the end of May. It's not clear when he might be ready to throw bullpen sessions.

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