Rookie power back Dwayne Washington is listed as questionable to play with an ankle injury. Washington missed last week's win.
Riddick's absence is a brutal blow to Detroit's offense. The pass-catching back took over the starting role with Ameer Abdullah on injured reserve. Riddick is a premier pass-catching back and a matchup nightmare for linebackers in space. The fourth-year pro already caught 26 passes for 190 yards and three touchdowns in five games. Matthew Stafford will sorely miss his security blanket Sunday versus the Rams' front seven.
The running back spot isn't the only one banged by injury for the Lions. Tight end Eric Ebron, linebacker DeAndre Levy and defensive tackle Haloti Ngata were all ruled out. Pass rusher Ziggy Ansah (ankle) is listed as questionable, but is on pace to return. Rookie DT A'Shawn Robinson (shoulder) is questionable. Guards Larry Warford (hip) and Laken Tomlinson (neck) are also listed as questionable -- not what you want to see when facing Aaron Donald.