Fermin was optioned to Triple-A Omaha on Friday.
After being called up one week ago, Fermin went 1-for-7 at the plate with two strikeouts while making two starts at catcher for the Royals. With Salvador Perez (back) expected to be available Friday, there is no longer a need for Fermin on the big-league roster. Nick Pratto was called up from Omaha to replace him.