SANTA CLARA, Calif. — Mike Singletary has made two more adjustments to his new coaching staff, firing quarterbacks coach Ted Tollner and running backs coach Tony Nathan.

On Tuesday, Singletary fired offensive coordinator Mike Martz after one season with the 49ers. Nathan also was in his first year with the team, while Tollner had two stints with the club during the past decade.

At his season-ending wrapup news conference, Singletary said he hasn't yet interviewed any replacement candidates for Martz's job, but wants his new coordinator to develop a sturdy running game.