Matz (shoulder) received a cortisone shot in his left shoulder Friday and played catch Sunday, John Denton of MLB.com reports.
How Matz responds to this latest round of treatment and the resumption of activity will likely determine how much longer he's sidelined. He's not eligible to return from the 15-day injured list until June 7. It's unclear if he'll need to make a rehab start prior to rejoining the Cardinals' rotation.