Manager Dave Roberts said Glasnow felt discomfort in his right elbow Friday while warming up for a simulated game, Fabian Ardaya of The Athletic reports.
Glasnow was slated to face live hitters for two or three simulated innings, but he instead returned to the clubhouse after warming up. The 31-year-old right-hander will get additional testing on his elbow to provide some clarity on his chances of returning before the end of the regular season, per Juan Toribio of MLB.com. Glasnow has been on the 15-day injured list since Aug. 16 due to tendinitis in his right elbow.