Tests last month revealed a partial tear of the ulnar collateral ligament in Harvey's pitching elbow.
Surgery would have ruled the 24-year-old right-hander out for the 2014 season, but with a successful rehab, he could be back on the mound next year.
He went 9-5 with a 2.27 ERA and 191 strikeouts over 26 starts this season, his second in the major leagues.
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