"Coach Petrino came down last week and offered me a scholarship, then Coach Summers came down yesterday, had dinner with us and I committed," explained Grady.
With the Cardinals needing to develop depth along the defensive front, Grady believes that he'll see playing time as a freshman.
"I'm pretty sure I'll see early playing time," Grady continued. "Coach Petrino was telling about how they need some rotation and that I'd probably get the chance to play some."
During his official visit last weekend, Grady claims that the Cardinals facilities and coaching staff were the reasons for his decision.
"I was very impressed by their facilities," said Grady, who was hosted by former Coffee County teammate and current Cardinal Early McCray. "I mean I was blown away. They were the best I have seen and I have seen a ton. I also love the coaches. They are very genuine and down to earth. Louisville is a place where I felt so comfortable."
Grady, 6-2 and 278 pounds, played middle linebacker and defensive tackle for Douglas (Ga.) Coffee County High School. He bench presses 440 pounds and squats 520.
He chose Louisville over heavy interest from both Auburn and Florida.
"They kept telling me that they'd like for me to come down to visit them, but I didn't want to wait any longer so I committed," Grady said.
Grady, who is fully eligible, was one of 400 nominees nationwide for the All American Bowl played in San Antonio last month.