The Cardinals signed Zimmermann to a minor-league contract Jan. 5 that includes an invitation to spring training.
Zimmermann made one spot start with the Brewers in 2025 but spent the rest of the season at Triple-A Nashville, where he held a 4.11 ERA and 109:30 K:BB over 138 innings. The left-hander will compete for a roster spot in spring training, but his likely role will be rotation depth at Triple-A Memphis.