The Raiders are planning a news conference Tuesday to introduce Gruden as their next head coach.
According to ESPN's Adam Schefter, the Raiders are giving Gruden a 10-year contract which is expected to be worth roughly $100 million for Gruden to return to the sidelines.
Current Los Angeles Rams quarterback coach Greg Olson will be Oakland's offensive coordinator, while former Cincinnati Bengals defensive coordinator Paul Guenther will serve in the same capacity under Gruden.
Despite not coaching in almost a decade Gruden has routinely been a magnet for head coaching rumors.
His final game with Oakland was among the most controversial losses in National Football League history, when the Raiders lost to the New England Patriots on the infamous Tom Brady "Tuck Rule" non-fumble call.
Gruden guided the Buccaneers to the 2003 Super Bowl title, defeating Oakland 48-21 in the championship contest.
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He amassed a 57-55 record in seven seasons as Tampa Bay's coach.
Gruden beat the Raiders in the Super Bowl in his first season with the Buccaneers but didn't win another playoff game for Tampa Bay in his final six seasons. ESPN reported that Davis was in hot pursuit for Gruden with a persuasive offer that included an ownership stake in the Raiders.
The NFL on Friday said the Raiders have complied with the Rooney Rule in their coaching search.
Also joining Gruden's staff will be Dallas' Rich Bisaccia as special teams coordinator.
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