The Cardinals claimed Munoz off waivers from the Marlins on Friday.
The Marlins optioned Munoz to Triple-A Jacksonville on Wednesday, Christina De Nicola of MLB.com reports.
Munoz (2-7) took the loss Friday against the Mets, allowing five runs (four earned) on five hits and three walks over 3.1 innings. He struck out five.
Munoz came away with a no-decision in Saturday's 9-8 extra-inning loss to the Padres, giving up three runs on six hits over five innings. He struck out three without walking a batter.
Munoz (2-5) picked up the win Wednesday over Tampa Bay, allowing two runs on four hits and two walks over five innings. He struck out seven.
The Marlins recalled Munoz from Triple-A Jacksonville on Tuesday, Christina De Nicola of MLB.com reports.
The Marlins optioned Munoz to Triple-A Jacksonville on Friday.
Munoz (1-5) took the loss Saturday as the Marlins fell 1-0 to the Mets, allowing one run on three hits and three walks over five innings. He struck out five.
Munoz (1-4) was charged with the loss against the Astros on Thursday, allowing six runs (four earned) on five hits and two walks over 6.2 innings while striking out two.
Munoz is slated to start Thursday's game against the Astros in Houston.