Stephen Piscotty left Tuesday night's game after being struck in the head by a throw from Chicago Cubs second baseman Javier Baez as Piscotty was sliding into home plate.
The Cardinals announced that Piscotty had a head contusion.
Mike Matheny said Piscotty would be evaluated later Tuesday evening, and then again Wednesday morning.
"The trainers asked him a lot of questions. He answered everything fine," Matheny said. "It just rung his bell, which we'll find out what exactly that means when the doctors give him a better test than just us asking him questions on the field. But he was coherent."