The Raiders have already brought back one former head coach.
Here are some of the top moments from Gruden's media session.
The 53-year-old originally joined Oakland in 2007, serving as the team's offensive line coach in 2007 and the first portion of 2008 before taking over as head coach during the latter season after Lane Kiffin was sacked.
Oakland Raiders head coach Tom Cable walks off the field after an NFL football game against the Baltimore Ravens in Oakland, Calif., Sunday, Jan. 3, 2010.More news: Man United boss Jose Mourinho gives big Zlatan Ibrahimovic update
He followed that feat with the now famous quote, "We're not losers anymore".
During Cable's first go-round with Oakland (2008-10) his teams posted a record of 17-27 (.386 win percentage).
Cable has spent the last seven seasons working as the assistant head coach/offensive line coach for the Seattle Seahawks before being dismissed on Wednesday.
Raiders owner Mark Davis told reporters at the same news conference he and Gruden reached an agreement on Christmas Eve and that he then fired Del Rio, after which the interviews were conducted to satisfy the Rooney Rule.More news: Indiana Pacers Game Recap: Running Out of Gas
In November of 2009, ESPN reported two women had accused Cable of physical abuse. It's also clear that the Raiders got their man in Cable.
The Merced, Ca. native got his first National Football League coaching job in 2006, when he was named the Atlanta Falcons' offensive line coach.
Seattle also fired offensive coordinator Darrell Bevell last week.
Gruden was on the Green Bay coaching staff from 1992-94 while Bennett was the Packers running back.More news: Bernard Tomic slide continues with Australian Open failure