The Cardinals transferred Rajcic (elbow) from the 15-day injured list to the 60-day IL Tuesday.
The transaction clears space on the 40-man roster for left-hander Bruce Zimmermann, who was called up ahead of Tuesday's doubleheader versus the Brewers. Per Jeff Jones of the Belleville News-Democrat, Rajcic will travel to Dallas for a second opinion with Dr. Keith Meister, and the Cardinals have "real concern" that the reliever has a serious elbow injury.