Cardinals running back Andre Ellington is scheduled to undergo an MRI on Monday after injuring his right knee in Sunday's opener against the Saints.
General manager Steve Keim told Arizona Sports 98.7 FM on Monday that Ellington said he "felt pretty good" and the team is optimistic his injury is not serious, per the team's official website.
Cardinals coach Bruce Arians said after Sunday's game if Ellington has to miss time, veteran Chris Johnson will take over as the starting running back and rookie David Johnson will assume the backup role.