Williams debuted in Week 2 at San Francisco, but has spent the last two weeks on the club’s practice squad.
Ross played in Chicago’s last two games, returning five kickoffs for 106 yards.
The club’s decision to move up Williams likely means he’ll take on the role of the club’s primary kick returner. Entering the season, the Bears expected Williams to seize that job in a competition that included Eric Weems, Micheal Spurlock and Michael Ford. But Williams suffered a hamstring injury during the preseason catching a 73-yard touchdown pass against the Jacksonville Jaguars.
The Bears originally brought Williams into the fold last December off the practice squad of the New Orleans Saints.