McKinney, 22, finished this season with 56 total tackles and 3.0 sacks for the Bulldogs. He led the team with 70 total tackles and 3.5 sacks in 2013 as a sophomore.
In his most recent first-round mock draft, Sports Illustrated's Chris Burke projects McKinney to be the No. 16 pick in the draft.
Mississippi State running back Josh Robinson declared for the draft last week after rushing for 1,128 yards this season. Quarterback Dak Prescott, who was a Heisman candidate during the season, has until Jan. 15 to declare for the draft.
Mississippi State opened the season 9-0 and was the No. 1 team in the country for four weeks. The Bulldogs finished the regular season 10-2 before losing in the Orange Bowl to Georgia Tech on New Year's Eve.
- Paul Palladino