DeJong was scratched from the lineup ahead of Saturday's game against the Royals for undisclosed reasons, Zachary Silver of MLB.com reports.
DeJong was not seen on the field for pregame warmups. Edmundo Sosa will take his place at shortstop. The Cardinals have an off day Monday, so it's possible DeJong sits Sunday as well to get three days off to recover from whatever is ailing him.