DETROIT -- Chicago White Sox left-hander Chris Sale is headed to the 15-day disabled list with what the team believes is a strained muscle in his throwing arm.
General manager Rick Hahn says the White Sox are erring on the side of caution, and that an MRI suggests no ligament damage.
Sale was supposed to face Tigers star Justin Verlander on Tuesday night, but now Chicago will be without its ace. Charlie Leesman is expected to start that game instead.
The 25-year-old Sale threw 127 pitches in a loss to Boston on Thursday. He's 3-0 with a 2.30 ERA on the season.
Sale went 11-14 with a 3.07 ERA in 30 starts last season, emerging as one of the American League's top pitchers amid a dismal season for the White Sox.