Williams is under evaluation for a concussion during Friday's preseason game at Arizona.
Williams earned three touches on the Chiefs' first possession, turning two carries into two yards and one target into an eight-yard catch. Clyde Edwards-Helaire got the initial RB reps with the starters, and Jerick McKinnon and Darwin Thompson after CEH and Williams, so the latter's standing as the No. 2 back in Kansas City appears to be holding up. However, if Williams is diagnosed with a concussion, he could give McKinnon a chance to move up the depth chart.