LAKE FOREST, Ill. (AP) — Chicago Bears safety Quintin Demps has practiced for the first time since breaking his left arm in late September.

His return to practice on Thursday opened a 21-day window for the Bears to decide whether to activate him from injured reserve or have him miss the remainder of the season. Demps started the first three games. He was injured against Pittsburgh on Sept. 24.

Demps says it "felt great" to practice, though he doesn't think he will be ready to play against San Francisco on Sunday. Injuries have left the Bears short-handed at safety.

Chicago re-signed safety Chris Prosinski while waiving linebacker Howard Jones on Thursday. Prosinski played for the Bears from 2015-16, appearing in 29 games and making six starts.

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