TEMPE, Ariz. (AP) Arizona Cardinals running back Andre Ellington has a sprained right knee, an injury that's less serious than initially feared, and coach Bruce Arians isn't ruling him out for Sunday's game at Chicago.

Ellington suffered a mild sprain of his right posterior cruciate ligament in Arizona's 31-19 season-opening win over New Orleans.

Such injuries usually sideline a player one to three weeks, but Arians thinks Ellington might play against the Bears.

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If Ellington can't go, Chris Johnson would move into the starting role with rookie David Johnson as his backup.

Carson Palmer's 55-yard touchdown pass play to David Johnson sealed Sunday's victory.

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