"For a freshman to be as productive as he is and do what he does is, in this league, pretty incredible," Chizik said.
Added defensive coordinator Brian VanGorder: "He's a handful because he's a good athlete that's creative."
Manziel is coming off a two-interception performance against LSU, which held him to 194 passing yards and 32 on the ground.
Auburn's inexperienced defense has struggled in slowing down uptempo offenses. The Tigers have experience that includes facing Oregon in the national title game two years ago. Plus, Chizik is a former Texas defensive coordinator.
"When I was in the Big 12, pretty much all we faced was spread offenses," Chizik said.