Ertz (hamstring) was added to the injury report Friday and is listed as questionable for Sunday's game in Detroit, Darren Urban of the Cardinals' official site reports.
The end-of-week addition is worrisome for anyone counting on the veteran tight end in a fantasy lineup this week, though it doesn't necessarily mean his hamstring issue is serious. If Ertz doesn't end up playing, the Cardinals will be left with Demetrius Harris and Darrell Daniels at tight end.