This is only Allen's third game of the season as he has missed seven because of a nagging left hamstring injury that occurred during the Sept. 11 opener against the Las Vegas Raiders.
Williams has been sidelined the past two games after suffering a high sprain to his right ankle during the fourth quarter against Seattle on Oct. 23.
While Herbert gets his top wide receivers back, Patrick Mahomes and the Chiefs are down a couple of playmakers. JuJu Smith-Schuster is out because of a concussion and Mecole Hardman is on injured reserve with an abdominal injury.
Marquez Valdes-Scantling was dealing with an illness most of the week, but is active.
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The Associated Press