Royals' Seth Lugo: Return delayed

Lugo (back) did not respond well to his bullpen session Monday, so he will be shut down for a few more days, Anne Rogers of MLB.com reports.

Lugo was looking at a possible return in the middle of the week, but Cole Ragans is set to start Wednesday and Stephen Kolek will now take the mound Thursday. Given the setback, Lugo's next start may not come until next week, if he's able to return at all before the end of the regular season.