Jernigan led Florida State with 11 tackles for loss in 2013, his first year as a full-time starter, and he was regarded as a strong run stuffer up the middle. Jernigan is widely projected as a first-round selection in this year's NFL draft and is rated as the No. 7 overall player by ESPN's Scouts, Inc.
"I feel I am the most versatile defensive lineman in the draft," Jernigan told ESPN's Joe Schad. "Some team will get an athletic, hard-working lineman who attacks, plays smart and doesn't come off the field."
Jernigan was essential in quieting Auburn's up-tempo running game during the middle of Monday's VIZIO BCS National Championship, allowing Florida State to chip away at a 21-3 deficit. When he was sidelined late in the fourth quarter, the Tigers quickly marched down the field for a score.
Jernigan started just two games in his first two seasons with Florida State but was a regular contributor off the bench. As a freshman in 2011, he recorded 30 tackles, including six for a loss, then added to those totals in 2012 with 46 tackles and eight for a loss.
Jernigan finished this season with 63 tackles, including 4.5 sacks and was a second-team AP All-American.
Junior running back James Wilder Jr. has also declared for the draft, while receiver Rashad Greene and offensive linemen Tre Jackson and Cameron Erving announced they would return for 2014.