Washington didn't participate in the Lions' practice Thursday, Tim Twentyman of the Lions' official site reports.
Washington's second straight absence from practice this week supports what was assumed all along: that he's not on track to play Sunday against the Vikings. In the likely event that Washington is inactive for a second straight contest, Zach Zenner would step in as the Lions' third running back. In the team's Week 3 loss to the Falcons, Zenner picked up five yards on three carries.