Hudson (elbow) was transferred to the 60-day injured list Thursday.
Hudson underwent Tommy John surgery in late September of last season and is expected to miss the entire 2021 campaign as a result, so his move to the 60-day IL is simply procedural. His removal from the 40-man roster will make room for outfielder Scott Hurst, whose contract was selected by the Cardinals after Lane Thomas was optioned to the alternate training site.