The Bears on Saturday activated defensive back Deiondre’ Hall from injured reserve and placed outside linebacker Isaiah Irving on injured reserve.

Hall returned to practice last week for the first time since being placed on injured reserve prior to the season opener with a hamstring injury he sustained in the preseason finale. The 2016 fourth-round pick from Northern Iowa was switched from cornerback to safety during the offseason.

Injuries have depleted the Bears at safety. Adrian Amos, who has started the last eight games, is doubtful on the injury report for Sunday’s game against the 49ers with a hamstring injury he suffered in last weekend’s loss to the Eagles. Backups Deon Bush and DeAndre Houston-Carson are both questionable with ankle injuries that prevented them from practicing Friday.

Irving, an undrafted rookie free agent from San Jose State, hurt his knee Wednesday in practice. He appeared in the last seven games after spending the first four weeks of the season on the practice squad, recording two tackles and one fumble recovery.

The Bears also made a practice squad move, re-signing linebacker Howard Jones and releasing tight end Colin Thompson. Jones was waived earlier this week after making his season debut on special teams in last Sunday’s loss in Philadelphia.