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Rivera said an MRI on Thursday revealed no damage and that Davis has a strained right calf.
Davis will not participate in Saturday's Fan Fest back in Charlotte but could return to practice next week. He hasn't practiced since Sunday.
That's encouraging news for Davis, who's trying to become the first known NFL player to return from three torn ACLs to the same knee. Davis tore his right ACL last September for the third time in three years and missed 14 games on injured reserve.
Rivera also said Friday that defensive tackle Ron Edwards would miss a few days of practice after hyperextending his right knee in practice Thursday night.