Washington (ankle) is listed as inactive Sunday against the Rams, Dave Birkett of the Detroit Free Press reports.
As expected, Washington will take a seat due to a serious ankle sprain in back-to-back outings. With Ameer Abdullah (foot) on injured reserve and Theo Riddick (ankle) sidelined, the Lions will entrust Zach Zenner and Justin Forsett with backfield duties in Week 6.