Mattison, who has interviewed with Michigan, coached with new Wolverines coach Brady Hoke under Jack Harbaugh at Western Michigan and Lloyd Carr at Michigan.
The Ravens defense has ranked in the top 10 in the NFL during both of Mattison's seasons as coordinator after Rex Ryan left to take the New York Jets coaching job.
The Sun reported defensive backs coach Chuck Pagano could be a front-runner to replace Mattison.
...says Denzel Valentine of Big Ten Tourney favorite MSU, which is 5-7 in its last 12 games. Cumong, man.