4-time champion, All-Pro tight end Rob Gronkowski announces retirement
Rob Gronkowski retirement: How the future HOF tight end's decision to hang up his cleats affects the Buccaneers
Rob Gronkowski is not retiring, but will he re-sign with Buccaneers?
Rob Gronkowski Announces Retirement
Rob Gronkowski retires: New England Patriots tight end steps away from NFL – The Denver Post
Rob Gronkowski Retiring From NFL
Tom Brady: Rob Gronkowski 'shocked' by former team-mate's retirement aged 45, saying he could still play until he is 50, NFL News
Buccaneers hopeful to re-sign Rob Gronkowski now that Tom Brady is back - Sports Illustrated
Patriots tight end Rob Gronkowski announces retirement
Rob Gronkowski on retiring from NFL at age 29: 'I didn't even want to negotiate' - Good Morning America
Rob Gronkowski Says 'Never' Rule Out NFL Return
Former Patriots Star Thinks Gronk Could Return: Fans React - The Spun: What's Trending In The Sports World Today
Why retired NFL star Rob Gronkowski never spent his NFL salary
Rob Gronkowski 'shocked' by Tom Brady un-retirement rumors