The Yankees on Thursday revealed that struggling shortstop Anthony Volpe has been playing since early May with a partially torn labrum in his left shoulder and has had at least two cortisone shots — one during the All-Star break in July and one on Wednesday.

Manager Aaron Boone said he doesn’t think the injury has affected Volpe’s play. He is expected to return once the effects of the shot wear off, perhaps as early as this weekend in Boston, but might continue to share the position with Jose Caballero .

Volpe is having the worst of his three big-league seasons and statistically has been one of the worst offensive and defensive players in baseball. He is batting .206 with 19 home runs, 70 RBIs and a .661 OPS . He has committed 19 errors, the second-highest total of any shortstop.

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