Cardinals' Quinn Mathews: On Triple-A IL with sore shoulder

Cardinals president of baseball operations John Mozeliak said that Mathews was placed on the 7-day injured list at Triple-A Memphis on Sunday due to left shoulder soreness, Daniel Guerrero of the St. Louis Post-Dispatch reports.

Mozeliak was unwilling to put a timeline on Mathews' return to action. Mathews' velocity was down in his last outing with Memphis on Friday, and he's posted a 6.10 ERA and 7:15 K:BB over his first 10.1 innings this season, so it's possible the shoulder has been nagging at him for a while. The Cardinals will proceed cautiously with the top prospect.