TAMPA, Fla. (WFLA) — Tampa Bay Rays All-Star pitcher Shane McClanahan is “highly unlikely” to pitch again this season, according to a report from ESPN.

Manager Kevin Cash told reporters that McClanahan will get a second opinion from a specialist due to an arm injury, according to ESPN’s Jeff Passan.

The Rays placed McClanahan on the 15-day injured list Thursday, one day after he left his start at the New York Yankees with left forearm tightness.

McClanahan, 11-2, left his last start on Aug. 2 in New York against the Yankees with tightness in his left forearm. He pitched four innings and gave up five runs. The 26-year-old has pitched five innings or less in five of his last six starts.

The Associated Press contributed to this report.