He had been listed as probable after fully participating in practice all week. Lee strained a hamstring in a 49-17 loss to New Orleans, and the Cowboys beat the New York Giants and Oakland without him.
Cornerback Morris Claiborne is out for a second straight game with a hamstring issue.
For the Bears, quarterback Jay Cutler (high left ankle sprain) and linebacker Lance Briggs (fractured shoulder) remain sidelined.
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