"First, they were just discussing how they liked my work ethic and they were telling me that I could bring something to the program," Riley said. "They complimented how I performed at the camp and competed. They like my hustle, speed and size and said I could blend in well with the future of the program.
"They actually offered me for running back and cornerback.
"They said they like how I have loose hips and turn well. I have quick feet and the height, size and speed to keep up with the tall receivers, and the speedy receivers."
Riley is willing to play either position on the college level and just wants to be an impact player at whatever school he chooses to attend.
"I don't know what position I want to play because I still have two more years," Riley explained. "Wherever they put me at I like to contribute to the team."
When Riley arrived at USC on Saturday, he had no idea that he would be leaving with his first college offer.
"It was great because I wasn't actually expecting it," Riley said of the USC offer. "That has always been my dream school (USC) and where I have always wanted to go. To get my first offer from them was just a dream come true."
Growing up in Southern California Riley is a big fan of the USC program and has always been impressed by Pete Carroll and the USC coaching staff.
"They always have a winning tradition and I feel really comfortable with the coaches," Riley said. "What I like about USC is that they have that winning attitude. They know that they are going to win games and always have the players. It's a great school.
"What separates Pete Carroll is his work ethic as a coach and he brings that winning attitude to the program. He is a great coach and has a great reputation."
After his wildly successful day at the USC Skills Camp, Riley said he can't wait to return to USC for the Rising Stars Camp later this month.
"It was a great experience." Riley said of the USC Skills Camp. "I am actually going back for the Rising Stars Camp and I am really looking forward to that.
"I am going to split time, I am going to play running back in the morning and then in the afternoon play defense."
Stay tuned to SCPlaybook.com for updates on Dietrich Riley throughout the recruiting process.
If you have any questions, comments or suggestions you can reach Kevin Carden