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Powell sustained a hamstring injury during Thursday's preseason game against the Buccaneers, Lindsay Draper of the Cowboys' official site reports.
Powell had a productive evening prior to suffering the injury, tallying four tackles (three solo) with one sack, one interception and a forced fumble on only 18 defensive snaps. The 25-year-old signed with the Cowboys in early August after being cut loose by the Texans.
