Naylor was removed from Sunday's game against the Nationals due to an apparent right shin injury, Adam Jude of The Seattle Times reports.
The 28-year-old fouled a pitch off himself during the top of the sixth inning and stayed in to finish his at-bat, but he was replaced by Patrick Wisdom at first base for the bottom of the frame. Naylor went 1-for-3 with a double prior to leaving the contest and should be considered day-to-day heading into Tuesday's series opener versus the Orioles.