Molina pointed to a very slow-moving game as one culprit.
"It was in the fourth inning, fifth inning, and we'd played two hours," he said. "It got tight. But I'm going to be OK tomorrow."
La Russa also said that he expects to play Molina on Friday against the Brewers, and that the flare-up was only a minor concern.
"He got a little gimpy there when he ran the bases," La Russa said. "That's why we got him out. But I think he'll be good. He'll play [Friday]."
STL: RHP Adam Wainwright (19-8, 2.58 ERA)
Wainwright will be going on an extra day of rest, and he can use it. He threw 130 pitches in the Cardinals' division-clinching win on Saturday in Colorado, and had to work hard for most of them. However, he may also have cemented a Cy Young Award with the performance. He'll be going for win No. 20, but it's unlikely that the Cardinals will push him in his last start before the playoffs.
MIL: RHP Braden Looper (13-7, 5.10 ERA)
Looper surrendered two more home runs in his most recent start and has served up 39 this season, most in the Majors and a Brewers record. He has allowed at least one homer in 12 of his past 13 starts. He's also allowed one in each of his two starts against St. Louis this season, but is 1-0 in those games with a 3.75 ERA.
Ryan Braun and Prince Fielder are a combined 12-for-55 (.218) with three home runs against Wainwright. ... Mark DeRosa is 2-for-20 against Looper. ... In two years as a starter with the Cardinals, Looper allowed 47 home runs, just eight more than he's given up this season alone with Milwaukee.
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Official game notes
Saturday: Cardinals (Kyle Lohse, 6-9, 4.84) vs. Brewers (Dave Bush, 5-9, 6.38), 12:10 p.m. CT
Sunday: Cardinals (Joel Pineiro, 15-12, 3.44) vs. Brewers (Chris Narveson, 2-0, 4.01), 1:15 p.m. CT