Cook rushed the ball three times for three yards in Saturday's 27-15 preseason loss to the Steelers.
Cook didn't do anything with his two touches, but his usage was more telling. He worked only with the first-team offense, and while Latavius Murray also got some work with Josh Allen, he notably played multiple possessions with backup Matt Barkley. All indications are that the Bills intend to deploy Cook as their top back come the regular season.