"We took a closer look at him," Matheny said. "We're confident that they didn't see anything major there, but enough so that we've got to be cautious."
Matheny said the team would keep a close eye on Adams and determine if he was available to pinch-hit in the series opener. Adams pinch-hit and struck out in the ninth inning Wednesday.
The first baseman has appeared in 52 of 53 games for the Cardinals this season, hitting .325 with 21 multihit games. His batting average ranks him fifth in the National League.
Allen Craig was at first for the second consecutive night with Adams out of the lineup, and Peter Bourjos and Jon Jay both got starts in the outfield.
Matheny said the injury currently isn't serious enough to warrant Adams being placed on the 15-day disabled list.
Alex Halsted is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.