Yadier Molina left Wednesday's game against the Pirates with a right thumb sprain.
Kevin Siegrist (forearm, shoulder) threw a bullpen session Wednesday and said he's ready for a rehab assignment.
Kolten Wong hit a walk-off home run, the second in as many nights for the Cardinals, to defeat the Pirates 5-4 on Tuesday.
Oscar Taveras had the first multi-hit game of his major league career on Tuesday, finishing 2-for-4 with a run scored against the Pirates.
Carlos Martinez allowed four runs, all on home runs, on eight hits over six innings of a no-decision against the Pirates on Tuesday.
Jaime Garcia will undergo thoracic outlet syndrome surgery on Friday.
Matt Adams hit the Cardinals' first walkoff homer since 2011 Monday in a 2-0 win over the Pirates.
Adam Wainwright shut out the Pirates for seven innings, striking out five, on Monday night.
Starting over Oscar Taveras, Allen Craig went 0-for-3 against the Pirates on Monday.
Michael Wacha (shoulder) will rest for two more weeks.
Tyler Lyons will pitch out of the bullpen for the Cardinals.
Joe Kelly (hamstring) will be activated from the disabled list to start Friday against the Brewers.
Kevin Siegrist (forearm, shoulder) threw another bullpen session Monday.
Cardinals recalled LHP Tyler Lyons from Triple-A Memphis.
Cardinals optioned LHP Marco Gonzales to Triple-A Memphis.