Williams missed last week's loss to Green Bay, and Quinn - second on the team to Khalil Mack with 5 1/2 sacks - was placed on the list on Tuesday.
Mack (foot), defensive tackle Akiem Hicks (groin) and receiver Allen Robinson (ankle) practiced Friday on a limited basis. All three were listed as questionable for Sunday, when the Bears (3-3) visit Tom Brady and the Tampa Bay Buccaneers. Chicago ruled out safety Tashaun Gipson Sr. (hip).
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