"If we get through today, we'll be in real good shape [Wednesday]," Yost said before Tuesday's 2-0 win over the Astros.
Royals relievers Tim Collins, Kelvin Herrera, Jonathan Broxton and Greg Holland were unavailable on Monday after extensive work last weekend. All were set to pitch if needed on Tuesday. Broxton was the only one to see action -- tossing a scoreless ninth for his 17th save.
Yost said the Royals could add a position player and demote a pitcher before Wednesday's series finale at Minute Maid Park.
Kansas City is currently carrying 14 pitchers and 11 position players.