Shaquille O’Neal has warned Jason Kelce about making ‘dumba** mistakes’ amid expectations the NFL icon is set to retire. Kelce’s future in the sport is currently shrouded in uncertainty, with his team-mates expecting the 36-year-old to walk away. O’Neal knows all about how difficult retirement could be, having quit basketball back in 2011. And the 51-year-old has now opened up, warning Kelce about making ‘dumba** mistakes’, having ‘lost his family’ due to poor judgement. “If you are going to retire, accept it,” he told The Big Podcast. “Enjoy your family brother. I made a lot of dumba** mistak…