ALAMEDA, Calif. — The Oakland Raiders have officially hired Denver defensive coordinator Jack Del Rio as their new head coach.

The team announced the hiring on Thursday, a day after finalizing the deal to have Del Rio replace interim coach Tony Sparano. A news conference is expected on Friday.

Del Rio becomes Oakland's ninth head coach since the start of the 2003 season. The Raiders have the NFL's worst record in that span, having failed to produce a single winning season or playoff berth.