Wacha (1-3) was saddled with the loss Sunday, allowing four runs on nine hits over 5.2 innings against the Tigers. He struck out three.
The Royals are planning to call up Bowlan from Triple-A Omaha on Monday to start the club's series opener in Toronto, Jaylon T. Thompson of The Kansas City Star reports.
Garcia went 2-for-5 with two RBI, a stolen base and one run scored in Saturday's 6-5 loss to the Tigers.
Stratton (2-2) allowed five runs on four hits and a walk while striking out one over one inning to take the loss versus the Tigers on Saturday.
Frazier will serve as the Royals' designated hitter and No. 9 batter in Sunday's game against the Tigers.
Melendez is out of the lineup for Sunday's game against the Tigers.
Isbel is out of the lineup for Sunday's game against the Tigers.
Massey is out of the lineup for Sunday's game against the Tigers.
Pasquantino is out of the lineup for Sunday's game against the Tigers.
Singer didn't factor in the decision Saturday at Detroit after he allowed one run on four hits and three walks over five innings. He struck out six.
Melendez is not in the Royals' starting lineup for Saturday's game against the Tigers.
Velazquez is not in the starting lineup for Saturday's game against the Tigers.
Hernandez (shoulder) began his rehab assignment with Triple-A Omaha on Friday.
Witt went 1-for-4 with a triple, three RBI and a run scored during Friday's 8-0 win at Detroit.
Lugo (4-1) earned the win Friday in Detroit after he struck out nine and allowed three hits and two walks across even scoreless innings.
Renfroe is out of the lineup for Friday's game against the Tigers.
Witt went 1-for-3 with a walk, one RBI, two stolen bases and one run scored in Wednesday's 3-2 win over the Blue Jays.
Schreiber (2-0) pitched a perfect inning and was credited with the win Wednesday over the Blue Jays.
The Royals recalled Klein from Triple-A Omaha on Thursday.
The Royals placed Marsh on the 15-day injured Thursday with a right elbow contusion.
Velazquez is out of the lineup for Thursday's game against the Blue Jays.
Renfroe is out of the lineup for Thursday's game against the Blue Jays.
Massey is absent from the lineup for Wednesday's game against the Blue Jays.
Stratton (2-1) did not allow a baserunner and struck out one batter over 1.2 innings to earn the win Wednesday versus the Blue Jays.
Witt went 3-for-4 with two RBI and a stolen base during Tuesday's 3-2 win over Toronto.