Davis was one of 29 collegiate linebackers who attended the NFL Scouting Combine, but was unable to perform any drills due to an ankle injury.
During the draft process, Davis attended private visits and workouts with the Detroit Lions and Pittsburgh Steelers.
Head coach Jim Caldwell officially named Davis the starting middle linebacker to begin the regular season.
[20] The following week, he recorded six combined tackles and made the first sack of his career on New York Giants quarterback Eli Manning in the Lions' 24-10 victory.
On December 10, 2017, Davis made nine combined tackles and sacked quarterback Jameis Winston as the Lions defeated the Tampa Bay Buccaneers 24-21.
In Week 17, he recorded a season-high 12 combined tackles, a pass deflection, and made his first career interception in a 35-11 win against the Green Bay Packers.
He made his interception off of a pass attempt by Brett Hundley that was intended for Jamaal Williams and returned it for 12 yards before being tackled by Lance Kendricks to end the Packers' first drive of the game.
[24] The Detroit Lions finished second in the NFC North with a 9-7 record but missed the playoffs, and thus the team decided to part ways with head coach Jim Caldwell at the end of the season.
[35] During OTAs, Davis suffered a knee injury and as a result, on July 18, the Giants placed him on injured reserve, ending his 2023 season.