Cardinals manager Tony La Russa said that he would try to avoid using Ankiel on Tuesday night but that he could probably play in an emergency.
Ankiel, who went 2-for-4 with an RBI single and two runs scored, suffered the strain while swinging during an at-bat on Monday night.
The outfielder has been red-hot over his past 17 games, hitting .419 with six extra-base hits and just three strikeouts.
B.J. Rains is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.