Just 'cause Rob Gronkowski is an NFL player again doesn't mean he's giving up his WWE 24/7 championship belt without a fight -- and he's already eyeing his own coach as a potential threat!!!
Remember, Gronk became the new 24/7 champ after beating up on Mojo Rawley at WrestleMania 36 last month ... pinning his friend to take over the shiny, new belt.
While it seemed like it was the beginning of a full-on career with Vince McMahon's org, the 30-year-old would end up BACK in the NFL weeks later to join his bestie Tom Brady on the Tampa Bay Buccaneers.