Dan Mullen has added to his staff in Gainesville.
Knox, who worked under Mullen at Mississippi State as a running backs coach (2009-17) and special teams coordinator (2014-17), also has had coaching stints at Ole Miss and Auburn.
Knox led the Bulldogs as the Mississippi State interim coach to a Taxslayer Bowl win over Louisville on Dec. 30.
Before his time in Starkville, Knox spent 14 years as Tommy Tuberville's wide receivers coach at both Ole Miss and Auburn.
Knox helped lead the Auburn offense to the top of the SEC in scoring in both 2004 and 2005.
Sunseri, who leaves the Oakland Raiders after two seasons, will bring with him 34 years of coaching experience to Gainesville, which includes 10 seasons in the NFL and five in the SEC.
Prior to his stint with the Raiders, Sunseri spent two years at Florida State (2013-14). He has been a defensive coordinator (Tennessee, 2012), assistant head coach at Alabama for Nick Saban (2009-11) and a seven-year defensive line coach for the Carolina Panthers (2002-08) of the NFL.
During his three year span in Tuscaloosa, the Crimson Tide won two national championships (2009, 2011).
The 2011 Crimson Tide outside linebackers flourished under Sunseri and contributed to the overall success of the defense. Lombardi and Butkus Award finalist Courtney Upshaw led the way with 17 tackles for loss and 8.5 sacks, which ranked second and fourth, respectively, in the SEC.
In 2010, Sunseri continued to build on his solid foundation from the national championship season. The defensive unit ranked third in the country in scoring defense and fifth in total defense.
In Sunseri's first season at Alabama in 2009, he helped guide the Crimson Tide to the national championship behind a dominant defense that ranked second nationally in four major categories: rushing defense, pass efficiency defense, total defense and scoring defense.