It will be the fourth consecutive game that Riddick misses. He leads the team with a modest 357 rushing yards.
Center Travis Swanson (concussion) is listed as doubtful and appears likely to miss his fourth straight game.
Standout cornerback Darius Slay (hamstring) is questionable but didn't discuss his prospects with reporters on Friday as he previously indicated he would earlier in the week. Slay said he was told by someone in the organization not to speak to the media.
Also questionable is linebacker DeAndre Levy (knee) and returner/receiver Andre Roberts (shoulder).