Left-hander Ryan Verdugo, obtained in the deal that also brought pitcher Jonathan Sanchez from the Giants for outfielder Melky Cabrera, was added to the roster. That brought the roster to 39, including 20 pitchers.
Verdugo, 24, has a 21-7 record and a 3.14 ERA in 101 games during his four-year Minor League career. A product of Louisiana State University, he was 8-6 with a 4.35 ERA last year for Double-A Richmond, his first year as a starter.
The deadline for clubs to submit their reserve lists was midnight ET on Friday. After four or five years as a professional, a player must be added to his club's 40-man roster or be exposed to draft by the 29 other clubs. If a player signs at 18 or younger, a team has five years to evaluate him. The team has only four years for a player who signs at age 19 or older.
The Royals already had brought up many of their top prospects last season, so few additions were necessary.
Unprotected players can be selected in the Rule 5 draft for $50,000 but must be kept on the Major League 25-man active roster all season or be offered back to the original team for $25,000. Last year, the Royals took pitcher Nate Adcock from the Pirates and retained him; he was in 24 games with a 1-1 record and a 4.62 ERA.
Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.