Apple (L) poses with Jarrius Robertson, a Louisiana teen who has become a sensation among Saints fans. Fourteen-year-old Jarrius Robertson, a die-hard New Orleans Saints fan from LaPlace, La., has been fighting a chronic liver disease that requires a transplant. While battling his ailment, Robertson has shown the kind of enthusiasm that has captured the affection of the Saints head coach Sean Payton, quarterback Drew Brees and other players on the team. On Sunday NFL Countdown (Sunday, 11 a.m. ET, ESPN), special contributor Annie Apple reports Robertson has become a source of inspiration and a social media sensation through his support of the Saints. He implores opposing players, “Don’t dance in my end zone." "He's happy, and he is joyful," Saints running back Mark Ingram said of Robertson. "There are so many things that like, you know, we get stressed out about, or that we get annoyed with, or that we're frustrated or upset [by] when in the grand scheme of things you look at his situation and he's battling a liver disease and he needs a new liver. And regardless of that, he's still happy." Gavin Cote contributed to this post. Apple asks Saints running back Mark Ingram about young Robertson’s impact on the team. Apple also interviews Saints head coach Sean Payton. During an appearance on ABC’s Good Morning America this fall, Payton offered Jarrius Robertson a one-week contract to join the team as a social media correspondent.