Guy, who commited to Louisville after Petrino made an in-home visit Tuesday night, said his mother, uncle and himself came away very impressed with Petrino's presentation.
"My mom, uncle Trenton and myself talked about what Coach Petrino had to say last night and we all really liked everything he told us," Guy said Wednesday night. "That's why I committed."
Guy admitted that Petrino was a huge factor in his decision.
"I like how Coach Petrino runs his team and the players seem to really get along," Guy said. "Coach Petrino was a major factor in my decision."
A speedy receiver who also returns punts and kicks, Guy will make an official visit to Louisville this weekend. The elusive Guy said Petrino wants him to play the x-spot in the Cardinals offensive system, an intriguing factor for the 5-10, 175-pound receiver.
"He told me he couldn't guarantee me a starting spot next season but he said I'd get an opportunity and the same amount of reps as the other receivers," Guy explained. "Coach Petrino told me I would play the x-receiver spot, which is their go-to receiver, and catch a lot of passes."
However, Guy says North Carolina, the home state team, isn't out of the running just yet for his services. He'll visit Chapel Hill January 14 and points to a strong relationship with one of the Tar Heels assistants as a reason why he's keeping his options open.
"I would have to really like their campus a lot," Guy said when asked what it would take to change his decision. "I didn't really get a chance to see their facilities the last time I was there. I also like Coach Brewer a lot. If I liked my visit, I could still go to North Carolina."
Guy said he also might schedule an official visit to East Carolina January 7.