Flores' minor league contract was voided after he failed a physical on Thursday, Jenifer Langosch of MLB.com reports.
Flores is set to have an MRI on his throwing shoulder Tuesday, Jenifer Langosch of MLB.com reports.
Flores signed a minor league contract with the Cardinals on Wednesday, MLB.com's Jenifer Langosch reports.
Flores was designated for assignment by the Marlins on Tuesday.
Flores (shoulder) tossed five hitless innings in a game with High-A Jupiter on Monday.
Flores (shoulder) was optioned to Triple-A Louisiana on Sunday, MLB.com's Joe Frisaro reports.
Flores (shoulder) was placed on the 15-day DL on Saturday.
Flores left Saturday's start after three innings due to a right shoulder strain, Joe Frisaro of MLB.com reports. He is considered day-to-day.
Flores will be called up as the 26th man to start Game 2 of the Marlins' doubelheader Saturday.
Flores is a candidate to make a spot start for the Marlins on Saturday, MLB.com reports.