The Kansas City Royals placed left-hander Danny Duffy and right-hander Brady Singer on the 10-day injured list Tuesday.
Duffy has a left flexor strain and his designation is retroactive to Saturday. Singer has right shoulder fatigue and his status is retroactive to Sunday.
In corresponding moves, the Royals recalled infielder Ryan McBroom and right-hander Tyler Zuber from Triple-A Omaha.
Duffy, 32, left his start Friday against the Baltimore Orioles after being hit on the knee by a comebacker. This marks the second time he has been sidelined by a flexor strain this season.
He is 4-3 with a 2.51 ERA in 13 games (12 starts) this season.
Singer, 24, was rocked for seven runs in two-plus innings in his last start Saturday against the Orioles.
He is 3-7 with a 5.13 ERA in 19 starts this year.
McBroom, 29, has hit .167 in five games with the Royals this season.
Zuber, 26, is 0-2 with a 6.35 ERA in 20 relief appearances for Kansas City in 2021.
–Field Level Media