Martinez is still dealing with some soreness in his foot and was removed from Sunday's game against the White Sox as a precaution, Anthony Fenech of the Detroit Free Press reports.
Martinez sprained his foot in mid-March during spring training and didn't make his debut with the big club until May 12 as a result. It doesn't sound like he's in danger of missing much -- if any -- time, but owners should nonetheless monitor his status closely as the team's series in Kansas City kicks off Monday. Consider Martinez day-to-day for now.