"I'm ready for the next challenge in my life," Gregory said in an email. "I look forward to the coaching I will receive and the chance to push myself alongside the best players in the world. Thank you to my coaches from all levels, the Nebraska fans, my teammates, and my family who have supported me from the start."
Gregory was a first-team All-Big Ten pick as a junior after leading the Cornhuskers with seven sacks. He was fourth on the team with 54 tackles, including 10 for loss. He also blocked two kicks. He missed or was limited in four games because of injury.
Considered one of the nation's top pass-rushers, the 6-foot-6, 240-pound Gregory finished his two-year Nebraska career with 17.5 sacks after transferring from Arizona Western Community College.
Gregory is currently projected to go fourth overall in ESPN NFL Draft Insider Todd McShay's latest mock draft and is rated fourth overall on the latest Big Board by ESPN NFL Draft Insider Mel Kiper Jr., who also ranks Gregory as the second-best player at the position.
The Associated Press contributed to this report.