The Royals claimed Moscoso on waivers from the Rockies on Nov. 2. He had pitched for the Rangers, A's and Rockies with an 11-12 Major League record and 4.16 ERA in 57 games, including 24 starts.
The move reduced the Royals' 40-man roster to 39 and the camp roster to 52 players, including pitcher Felipe Paulino, who is on the disabled list.
Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.