DETROIT -- Major League Baseball on Thursday announced makeup dates for the four-game Tigers-Cardinals series that was postponed this week. The teams will play a pair of seven-inning doubleheaders -- one on Aug. 13 at Comerica Park starting at 1:10 p.m. ET, the other on Sept. 10 at Busch Stadium starting at 2:15 p.m. ET. Both dates were originally off-days for Detroit; Aug. 13 opened for the Cardinals when their Field of Dreams Game in Iowa for that day was cancelled.

 To account for the travel to St. Louis, the Tigers’ Sept. 9 home game against the Brewers has been moved up to 1:10 p.m. ET.

 The doubleheader means the Tigers will need a sixth starter for next week, which likely explains why manager Ron Gardenhire said the team is still debating their rotation options beyond Michael Fulmer.

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 “Fulmer's going to be in there, and we're still working on the last one, where we're going,” Gardenhire said on Thursday afternoon before the scheduling announcement.

 The Tigers can use a 29th player for the doubleheaders, which could mean a long-awaited spot start for top pitching prospect Casey Mize.

 It would not be the first time the Tigers used a doubleheader to debut a highly anticipated prospect. In 2005, Justin Verlander made two spot starts in doubleheaders, including his Major League debut on July 4 in Cleveland, before cracking the Tigers' rotation the following spring.