Johnson had three carries for two yards in Saturday's preseason game against Oakland.
David Johnson, Chris Johnson and Andre Ellington all got playing time on Arizona's 14-play opening drive. Only Ellington was involved thereafter, cementing the notion that the elder Johnson is locked in as the No. 2 running back, though Ellington or Kerwynn Williams likely would also have a role if David Johnson were to miss time during the season. Considering who's in front of him, the 31-year-old doesn't figure to get as many touches as the typical No. 2 back.