Needing help because of injuries at the safety position, the Bears signed Troy Nolan on Wednesday, team officials announced.
Starting safety Chris Conte suffered a hamstring injury in last week's win at Arizona, and he could be questionable to play against Detroit this weekend.
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Nolan, who was drafted in the seventh round by Houston in 2009, has 73 tackles and 3 interceptions in 37 NFL games. He had seven starts with the Texans and Miami Dolphins this season.