Thomas was optioned to Triple-A Memphis on Monday.
Thomas was slowed by rib-cage soreness early in spring but has since returned to action. He'll open the season at Memphis, where he hit .275/.321/.496 in 32 games last season.
Thomas' spring is off to a slow start due to rib cage soreness, Derrick Goold of the St. Louis Post-Dispatch reports.
Thomas felt a cramp during a check swing early in camp and has since been diagnosed with an intercostal injury. The issue isn't expected to be a serious one, and he could return to game action within a week. The 23-year-old hit .264/.333/.489 across the two highest levels of the minors last season. He's not in competition for an Opening Day roster spot but will have a chance at making his debut sometime later in the season.
Thomas had his contract purchased from Triple-A Memphis on Tuesday.
The Cardinals added Thomas to their 40-man roster in order to protect the 23-year-old from the upcoming Rule 5 draft. He spent most of the 2018 season with Double-A Springfield, slashing .260/.337/.487 with 21 homers and 13 steals across 100 games before earning a promotion to Memphis. He hit .275/.321/.496 with six homers and four stolen bases in 32 games the rest of the season with the Redbirds. Thomas could make his way to the majors in 2019, though it would likely take multiple injuries for him to carve out a significant role.
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|More Batting Stats|
|Minor League Batting Stats|
|2014||R-Gcl Blue Jays||34||131||21||34||8||4||0||11||21||33||7||3||.362||.382||.260|
|2014||R-Bluefield Blue Jays||18||65||10||21||4||0||1||8||6||16||2||0||.384||.431||.323|
|2016||R-GCL Blue Jays||6||21||8||9||5||0||1||4||2||6||2||1||.478||.810||.429|
|2017||AFA-Dunedin Blue Jays||73||274||34||69||12||6||4||38||27||84||8||7||.319||.383||.252|
|2017||AFA-Palm Beach Cardinals||9||35||5||9||0||1||0||3||3||10||2||2||.308||.314||.257|