Rob Gronkowski, Buffalo Bills target if he decides not to retire
Patriots Tight End Rob Gronkowski Announces Retirement
Four-time Super Bowl champion Rob Gronkowski retires from NFL for second time, NFL
Former Patriots great Rob Gronkowski retires for a second time
Rob Gronkowski Intends To Retire
Tampa Bay Buccaneers TE Rob Gronkowski retiring from NFL for second time - ESPN
Rob Gronkowski retires, won't join Tom Brady for 3rd season
Buccaneers tight end Rob Gronkowski retires for second time
NFL: Over and out as Gronkowski retires for second time