Zenner (concussion) is considered questionable for Sunday's game against the Giants.
Zenner was limited throughout practice this week, suggesting he's yet to clear concussion protocol following last Sunday's injury. If Zenner is unable to receive clearance prior to Detroit's 1:00 ET kickoff, Michael Burton could be brought into a bigger role behind Dwayne Washington, as starter Theo Riddick (wrist) is listed as doubtful.