Tampa Bay Rays right-hander Tyler Glasnow has been diagnosed with a partial tear of the ulnar collateral ligament in his pitching elbow as well as a flexor strain.
Glasnow, 27, was placed on the 10-day injured list on Tuesday. A timetable for his return will be determined after further medical evaluation.
In a corresponding roster move, the Rays recalled infielder Mike Brosseau from Triple-A Durham. He will start at second base and bat fifth Tuesday night against the host Chicago White Sox.
Glasnow left his last start -- a 5-2 win over the White Sox on Monday -- after just four innings and 53 pitches. He was initially diagnosed with right elbow inflammation.
In 14 starts this season, Glasnow is 5-2 with a 2.66 ERA. He has 123 strikeouts in 88 innings.
In 104 games -- 65 starts -- with the Pittsburgh Pirates (2016-18) and Rays, Glasnow is 20-20 with a 4.04 ERA.
--Field Level Media