One day before facing the Raiders in Las Vegas, the Bears on Saturday made the following roster moves:
• Inside linebacker Danny Trevathan was activated off injured reserve. The 10th-year pro opened the season on IR with a knee injury and missed the first four games. (He was required to miss at least the first three contests.) Trevathan returned to practice Sept. 29, beginning a three-week period in which the Bears had to decide whether to put him back on their 53-man roster. Trevathan has changed jersey numbers from 59 to 6, the first number he wore in Pee-Wee football.
• Running back David Montgomery was placed on injured reserve due to a sprained knee he sustained early in the fourth quarter of last Sunday's win over the Lions. He can return to the active roster after sitting out the next three games.
• Defensive tackle Akiem Hicks was downgraded from doubtful to out of Sunday's game against the Raiders due to a groin injury he suffered last weekend on the Lions' first play from scrimmage. Hicks did not travel with the Bears to Las Vegas.
• With Montgomery unavailable, running back Ryan Nall was flexed from the practice squad to the active roster. Nall likely will serve as the third running back behind veteran Damien Williams and rookie sixth-round pick Khalil Herbert while also contributing on special teams. For the second straight season, NFL teams can flex up to two players from their practice squads to their active rosters without having to subject any players to waivers.