The Astros are describing McCullers' injury as right elbow discomfort, Jake Kaplan of The Athletic Houston reports.
McCullers could be seen gesturing to his right elbow after facing the second-to-last batter in the fourth inning, Fabian Ardaya of The Athletic Los Agneles reports. The right-hander got out of that inning but was removed from the game before he was allowed to throw a pitch in the fifth inning. McCullers is next scheduled to pitch Friday at home against Seattle, which gives the Astros some time before they need a fifth starter again.