ESPN's Jim Trotter is reporting that Jason Tarver will be joining the San Francisco 49ers as a senior defensive assistant and linebackers coach.

Tarver has been the defensive coordinator with the Raiders since 2012. In 2011, he was the defensive coordinator and linebackers coach at Stanford. From 2001 to 2010, he was on the 49ers' staff, where he served as an offensive quality control coach, assistant running backs coach and offensive assistant, and outside linebackers coach.

He served with Tomsula for four years with the 49ers and coached a young Patrick Willis.