Riley O'Brien Injury: 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.

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.