Sierra was claimed by the Royals in the midst of the World Series after the White Sox placed him on waivers. In 135 plate appearances with Chicago this past season, the 26-year-old batted .276/.311/.417 with two home runs. Defensive metrics were never kind to Sierra while he was with the Blue Jays (from whom the White Sox claimed him), but he did post passable grades in both Defensive Runs Saved and Ultimate Zone Rating in a small sample of work with the Sox this past year.
The Royals have plenty of outfield depth on the Major League roster it is following the club’s reported agreement with Alex Rios, so it’s not particularly surprising to see Sierra cut loose. Kansas City still has Rios, Alex Gordon, Lorenzo Cain and Jarrod Dyson on board to soak up most of the team’s playing time in the outfield.