Mattison, who was the Gators' co-defensive coordinator and defensive line coach, is expected to coach the Ravens' linebackers.
No official announcement was made Sunday, but Mattison could be introduced by the Ravens as soon as Monday.
Meyer told Florida reporters Sunday that Mattison initially turned down the Ravens, but accepted a second, increased contract offer. Meyer added that it was an emotional decision for Mattison to leave the college ranks.
"We're going to miss Greg," Meyer said. "He's a man's man."
Mattison coached with Harbaugh at Western Michigan in the 1980s and is a former defensive coordinator at Notre Dame and Michigan. He also has prior coaching stints at Texas A&M, Navy and Northwestern.
Reach staff writer Aaron Wilson at 410-857-7896 or email@example.com.
Ravens hire Mattison
Ravens Insider Top Stories
Fantasy Football PK and DEF Target PointsSenior Fantasy Football Expert Shawn Childs looks at the strategies behind the often forgotten kickers and defenses in the Fantasy Football world.
Daily Dr. Roto: DFS Plays For Week 4The one and only Dr. Roto provides a list of players he's targeting at each position on DraftKings and FanDuel in Week 4!
Scout FantasyYesterday at 9:47 AM
Week 4: 7 Game-Changing Deep SleepersFantasy Football Expert Jack Delaney reveals some under-the-radar players that could help you gain an edge in your Week 4 matchup.
Scout FantasyYesterday at 7:55 AM
Jets resign WR/KR Jeremy RossAlmost 24 hours after the Jets announced wide receiver Jalin Marshall has a torn shoulder labrum, the team has resigned training camp standout Jeremy Ross among other roster moves.
Jets InsiderThursday at 7:17 AM
Osemele Looking Forward To Playing RavensKelechi Osemele looks at playing the Ravens like playing one's "little brother"
SB ReportWednesday at 1:06 PM