"He's continuing to play well at Triple-A, which we fully expected him to do. Ultimately, it's my job to figure out when the time is right and create an opportunity for him on the team."
Butler was batting .263 with just one home run and 18 RBIs in 53 games with the Royals when he was optioned to Omaha on May 29.
For Omaha, through Monday, he was hitting .351 (34-for-97) with five homers, a triple, six doubles and 13 RBIs in 25 games. He had 13 walks with only six strikeouts.
"He's swinging the bat well, playing a lot of first base and doing fine -- we'll just have to see how it plays out," Moore said.
Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.