Alcantara was reassigned to minor-league camp Monday, Jenifer Langosch of MLB.com reports.
The 21-year-old pitched in Single-A Peoria and High-A Palm Beach in 2016, posting a 3.96 ERA with a 153:59 K:BB across 122.2 total innings. Despite having only pitched in High-A up until this point, don't rule out the possibility of Alcantara pitching in the majors in 2017, as the Cardinals have notoriously skipped Triple-A stints with prior pitching prospects such as Trevor Rosenthal and Carlos Martinez.