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Jhoulys Chacin Injury Update: Rockies Pitcher Diagnosed With Pectoral Injury, Nerve Entrapment

Injured Colorado Rockies pitcher Jhoulys Chacin visited with a vascular surgeon in St. Louis and finally learned what has really been ailing him.

Chacin has an injury to his pectoral minor muscle involving a nerve entrapment. There’s no structural damage to his biceps, shoulder or elbow. This can be addressed through mobilization and strengthening exercise, but he won’t be allowed to throw for another few weeks at least.

"We have identified why there was a couple of miles per hour drop in his fastball," manager Jim Tracy said. "We are encouraged by this news."

Related: Ramon Hernandez Injury: Rockies Catcher Placed On DL With Sprained Left Hand

Chacin, who has not pitched for Colorado since May 1, is 0-3 with a 7.30 ERA this season.

For updates, stay tuned to SB Nation Denver. For more in-depth coverage, visit Rockies blog Purple Row. Head over to Baseball Nation and MLB Daily Dish for more news and notes around the majors.