Matz (shoulder) will be reinstated from the 15-day injured list to start Sunday's game against the Reds, Katie Woo of The Athletic reports.
Matz hasn't pitched for the Cardinals since May 22 due to left shoulder inflammation, but he recently made four rehab appearances at Triple-A Memphis and posted a 2.13 ERA, 17:3 K:BB and 0.95 WHIP in 12.2 innings. The southpaw made four starts in May prior to landing on the injured list, and he logged a 5.95 ERA and 1.12 WHIP in 19.2 innings over that span.