Coach Leslie Frazier had said the six-time Pro Bowler would be ready to make his season debut Sunday after missing last week's loss to Detroit because of an injured right knee. Williams was hurt in a preseason game against San Francisco.
He missed Friday's practice because of personal reasons after participating in the first two of the week.
With Williams playing, the Vikings have all their key players available. The same goes for the Bears.
AP NFL website: www.pro32.ap.org
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