Officially listed with a shoulder injury, Miller appeared in just six games and played mostly on special teams in his 13th season.
The Bears released him in February to avoid paying a roster bonus but brought him back in September following several weeks of talks after first-round draft pick Chris Williams injured his back early in training camp. A fifth-round draft pick by St. Louis in 1996, Miller appeared in 192 games -- 52 with Chicago the past four years.
He helped the Bears reach the Super Bowl two years ago after playing in one with the Rams, the Bears' opponent on Sunday.
A fourth-year pro, Rideau spent the first 11 weeks on the practice squad after catching five passes for a team-leading 127 yards and three touchdowns in the preseason.