Jackson started nine games at cornerback in 2014 and was selected a Freshman All-American. Jackson made 49 tackles and broke up 10 passes. He also returned two kickoffs for touchdowns and played as a receiver.
The 5-foot-11, 185-pound Jackson also has appeared on watchlists for the Hornung Award, which recognizes college football's most versatile player, and the Bednarik Award and Nagurski Trophy, both of which honor a national defensive player of the year.
Mark Carrier of USC won the Thorpe Award in 1989.
USC is set to begin training camp on Aug. 8.