Keller was removed after three innings during his start Sunday against the Blue Jays due to lower-back tightness. He was charged with three runs on seven hits and no walks while striking out three before departing.
Keller left with the Blue Jays up 3-0, so he'll be on the hook for his 10th loss of the season if the Royals aren't able to overcome the deficit. Kansas City is describing Keller's removal from the contest as precautionary, but he'll still need to throw a bullpen session in the next two or three days without any discomfort in order to avoid a trip to the injured list. Keller tentatively lines up to make his next start during next weekend's series in St. Louis.