"We'll go day-to-day with it," Yost said. "It just depends on the matchup. But for the foreseeable future, yeah, probably."
Valencia had no luck against Buehrle, going 0-for-3 against him in the Royals' 7-3 loss. He also struck out against lefty reliever Aaron Loup.
This season, Valencia is 3-for-13 against lefty pitchers; Moustakas is 1-for-11.
Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.