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Smyly undergoes plasma injection in an effort to stimulate healing in elbow

Injured Mariners left-hander Drew Smyly remains on a six-to-eight week recovery program after receiving a platelet-rich plasma (PRP) injection Tuesday on his injured elbow.

"Our timeline hasn’t changed," general manager Jerry Dipoto said. "Six weeks until he begins throwing. Eight until we anticipate we can make a better judgment on when he will rejoin the club."

Dipoto announced the medical update shortly after the Mariners transferred Smyly to the 60-day disabled list to create room on their 40-man roster for reliever Evan Marshall, whom they acquired in a waiver claim from Arizona.

Smyly complained of a sore elbow following a March 28 bullpen workout in Peoria, Ariz.