Zenner's teammate Dwayne Washington (ankle) is listed as doubtful for Sunday's game against the Eagles, the Detroit Free Press reports.
With Washington unlikely to play, Zenner will serve as the power complement to receiving specialist Theo Riddick. However, the Lions have been much more willing to use Riddick as a runner this season, and he still figures to get the start in a difficult matchup. Zenner could be the favorite for clock-killing and goal-line work, but the Lions won't necessarily find themselves in either scenario against a 3-0 Philadelphia squad.