Montgomery (hamstring) will start Tuesday's game against the Marlins at Busch Stadium, Jeff Jones of the Belleville News-Democrat reports.
The Cardinals will have a bullpen game Monday to buy Montgomery as much time as possible after he exited his most recent start July 7 with a minor hamstring injury. He had a rough start to the season, but the veteran southpaw has a 1.48 ERA, 0.91 WHIP and 41 strikeouts in 42.2 innings over his last seven starts.