2021 NFL free agency: Biggest moves/non-moves
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Khalil Mack trade: Bears, Raiders have agreement in place - Windy City Gridiron
New England Patriots - 2021 Season Recap
Bears or Raiders: Who won the Khalil Mack trade? - Chicago Sun-Times
Chicago Bears reach agreement to trade for Khalil Mack from Oakland Raiders - ESPN
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Browns explored trade for Khalil Mack before Raiders shipped him to the Bears