Harris rushed the ball four times for 17 yards in Saturday's 9-3 preseason loss to the Bills.
The Pittsburgh offense was stymied for nearly the entire game, though Harris did manage a tough nine-yard run late in the first quarter to pick up a first down. The far bigger development Saturday was that Jaylen Warren was forced to exit the game with a hamstring issue. It's unclear how serious the injury is, but it could leave Harris as the clear lead back early in the regular season.