Mathews will be recalled from Triple-A Memphis to start Saturday's game in Philadelphia, Derrick Goold of the St. Louis Post-Dispatch reports.
He's grabbing the spot vacated by Andre Pallante (elbow) and will receive at least two turns through the Cardinals' rotation. Mathews has posted a 3.27 ERA and 120:61 K:BB over 99 innings covering 21 starts at Memphis in 2026, and he's allowed three runs with a 10:6 K:BB over nine innings in two starts for St. Louis.