[2] Rated a three-star recruit, Greenard committed to play college football at Louisville over Kentucky.
He was a key reserve at linebacker as a redshirt freshman recording 22 tackles (seven for loss) and 2.5 sacks along with two passes broken up and an interception, which he returned 42 yards for a touchdown.
[10] He was named the Southeastern Conference co-Defensive Lineman of the Week after making six tackles with 1.5 sacks against Miami in his first game as a Gator.
[17] In Week 11 against the New England Patriots, Greenard recorded his first career sack on Cam Newton during the 27–20 win.
[21] On March 13, 2024, Greenard signed a four-year, $76 million contract with the Minnesota Vikings.