Ellington (toe) has been ruled out for Sunday's game in St. Louis.
As expected, Ellington will miss at least one game due to the turf toe injury he suffered in Week 12. David Johnson is thus set to serve as the unquestioned leader of Arizona's backfield in Sunday's game, but with Chris Johnson done for the season, Ellington may still get his shot at an increased role. David Johnson will be backed up by Stepfan Taylor and Kerwynn Williams.