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The Cowboys will be without a key member of their secondary for the foreseeable future. NFL Network is reporting that Dallas safety Donovan Wilson could miss four-to-six weeks due to a right calf strain that he suffered in the first practice of camp on Wednesday. Wilson led the team with 101 tackles last season and is entering the first year of a three-year deal that he signed in March. In other news, fellow safety Israel Mukuamu left practice early with a hamstring injury and the team signed defensive back Josh Butler.