Manager Matt Quatraro said that Witt is out of the lineup for Sunday's game against the Padres due to back tightness, Anne Rogers of MLB.com reports.
The 26-year-old went 0-for-4 with a strikeout while playing through the injury Saturday, and the Royals will be cautious with their All-Star shortstop. Witt should be considered day-to-day heading into Monday's series opener against San Francisco.