SANTA CLARA — The 49ers” linebacker corps, one of the league”s most talented units, will be coached by Jason Tarver, a league source confirmed Wednesday.

The 49ers have not confirmed Tarver”s hiring or any other staff changes since coach Jim Tomsula”s promotion a week ago. New coordinators are needed to replace Greg Roman (offense; now with the Bills), Vic Fangio (defense; Bears) and Brad Seely (special teams; Raiders).

Sports Illustrated first reported Tarver”s hiring.

Tarver, 40, spent the past three seasons as the Raiders” defensive coordinator, and he got his NFL coaching start with the 49ers in 2001 as an offensive quality control coach.

Tarver moved to the defensive side in 2005 and coached the 49ers” outside linebackers until 2010, giving him experience working with mainstays Patrick Willis and NaVorro Bowman.

Bowman did not play last season while recovering from knee surgery, and Willis missed the final 101/2 games because of toe surgery. Willis” replacement, Chris Borland, emerged as a rookie star before sitting out the final two games with an ankle injury.

Jim Leavitt had coached the 49ers” linebackers since 2011, and he was let go along with most of former coach Jim Harbaugh”s staff last week. Fangio coached the outside linebacker unit, which includes Aldon Smith, Ahmad Brooks, Aaron Lynch, Dan Skuta and Corey Lemonier.

A product of Foothill High-Pleasanton, Tarver was Stanford”s co-defensive coordinator in 2011 before joining the Raiders in that capacity in 2012.

As for their coordinator search, Rob Chudzinski and Vance Joseph are two candidates who have been blocked by their current clubs to interview with the 49ers, according to multiple reports.

The Indianapolis Colts are barring Chudzinski, a special assistant, from interviews elsewhere, including the 49ers and St. Louis Rams. Chudzinski”s contract expires next week, and he could become available if the Colts don”t re-sign him, the St. Louis Post-Dispatch reported.

Joseph is the Cincinnati Bengals” defensive backs coach, a role he held with the 49ers from 2005-10. The Bengals have prevented him from speaking with the 49ers about becoming their defensive backs coach and assistant head coach, as well as the Denver Broncos, according to the Denver Post.

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