According to the club's website, Allen will be introduced at a news conference on Monday.

Allen, who spent this past season as defensive coordinator of the Denver Broncos, reportedly reached an agreement with the Raiders and new general manager Reggie McKenzie earlier this week.

The Raiders needed a replacement for Hue Jackson, who was fired January 10 -- McKenzie's first official day on the job -- after just one season as head coach.

Allen was named defensive coordinator of the Broncos on January 24, 2011. He had been with the New Orleans Saints the previous five seasons, serving as assistant defensive line coach from 2006-07 and as the secondary coach from 2008-10.

The Broncos had the NFL's 20th-ranked defense during the regular season and won the AFC West at 8-8. They edged Oakland for the division title on a tiebreaker, then beat Pittsburgh in the wild card round of the playoffs before losing to New England in the divisional round.

Allen will become Oakland's seventh different head coach since Jon Gruden left after the 2001 season. Bill Callahan spent two years as head coach and guided Oakland to the Super Bowl after the 2002 campaign, losing to Gruden's Buccaneers, but the Raiders haven't had a winning season since.