Rob Gronkowski is finally getting around to filing his retirement papers -- the superstar tight end is signing a one-day contract with the New England Patriots to officially end his Hall of Fame career.
The organization confirmed the news Monday morning ... saying Gronk will sign an honorary deal to ride off into the sunset as a member of the Patriots.
The greatest tight end in @NFL history is retiring a Patriot!
Watch @RobGronkowski sign his one-day contract this Wednesday at 12:15 PM LIVE on Patriots digital & social.