Kowar will join the Royals' major-league spring training camp, Jeffrey Flanagan of MLB.com reports.
Kowar may not be considered for an Opening Day roster spot, but he doesn't appear to be too far away. In 13 starts for Double-A Northwest Arkansas last season, he recorded a 3.51 ERA and a 25.2 percent strikeout rate.
Kowar was promoted to Double-A Northwest Arkansas on Friday, Jeffrey Flanagan of MLB.com reports.
Last year's 33rd overall pick, Kowar recorded a 3.53 ERA through 13 starts with High-A Wilmington. He projects as a future back-end starter with the upside to be more than that, with his profile driven by strong velocity and a plus changeup.