One of college football's most explosive receivers, Green-Beckham had a breakout season for the Tigers in 2013 with 59 receptions for 883 yards and 12 touchdowns as a sophomore. He was one of the nation's top recruits in the Class of 2012, ranking No. 3 on the ESPN150.
Green-Beckham was kicked out of the program after an initial suspension. His troubles included being investigated for allegedly pushing an 18-year-old Missouri student down at least four stairs. No charges were filed and the case was closed after the student and a roommate declined to press charges.
Green-Beckham also had two marijuana-related arrests during his time at Missouri.
The Sooners are searching for impact players at the receiver position with Sterling Shepard as the lone proven receiver on the roster. OU was one of the finalists for Green-Beckham out of high school, as he made several visits to Norman, Oklahoma, before the 6-foot-6, 220-pound receiver eventually picked Missouri.
ESPN.com's Jake Trotter contributed to this report.