NFL news roundup: Gronkowski injury timetable still unknown, Bengals to go on 'Hard Knocks'

Rob Gronkowski is set to undergo back surgery Tuesday, and while a large portion of his recovery will be eaten up by rehab on his previously surgically repaired forearm, he may still miss additional time with the New England Patriots. ESPN's Ed Werder reported Monday that the Pats still have no idea when Gronkowski will return. There is a chance that Gronkowski will be on the physically unable to perform list throughout training camp. If so, he will have to be added to the active roster before t...