Rob Gronkowski announces his NFL retirement, but his agent not convinced
Rob Gronkowski closes the door on possible NFL comeback, says he's 'happily retired'
Rob Gronkowski retires from NFL after 11 seasons, 4 Super Bowls
Tom Brady Has Perfect Response to Rob Gronkowski's Retirement
Tampa Bay Buccaneers Tight End Rob Gronkowski Announces Retires, 11 NFL Seasons and 4 Super Bowls
Bucs' Rob Gronkowski retires, leaves door open for NFL return
Tight end Rob Gronkowski announces his retirement from NFL after 11 seasons spent with both the New England Patriots and Tampa Bay Buccaneers
Rob Gronkowski: NFL tight end announces retirement
Bucs' Rob Gronkowski Breaks Silence on Retirement