Reyes was placed on the 10-day disabled list with a right lat strain Thursday.
It was originally thought that Reyes avoided injury after experiencing a noticeable dip in his velocity during his 2018 big-league debut against the Brewers on Wednesday, but an evaluation upon his return to St. Louis confirmed the young right-hander suffered a lat injury that will require a stint on the disabled list. It's unclear how long Reyes will be sidelined with the issue, but the Cardinals figure to handle the 23-year-old with extra care seeing as Wednesday was his first game back from an extended absence due to Tommy John surgery. He tossed four scoreless innings in his first big-league start since 2016 prior to suffering the injury. Mike Mayers was recalled from Triple-A Memphis in a corresponding move.