The Raiders did not disclose financial terms of the new agreement.
With the coach locked up, Raiders general manager Reggie McKenzie took a significant step in securing the foundation of this team.
The team announced Friday evening that Del Rio's original contract - which he had just finished the second of four years of - had been "torn up" and replaced with a new contract. Oakland compiled the NFL's worst record from 2003 until Del Rio arrived.
Oakland returned to the playoffs for the first time since 2002 during the 2016 season.
Look for McKenzie to now turn as much of his attention as he can (with the National Football League draft coming up) to locking up his franchise quarterback Derek Carr, and defensive player of the year Khalil Mack. Without him in the playoffs, Oakland lost to the Houston Texans in the wild-card round. The Raiders were coached by Mike Shanahan, Art Shell, Mike White, Joe Bugel, Jon Gruden, Bill Callahan, Norv Turner, Shell again, Lane Kiffin, Tom Cable, Hue Jackson, Dennis Allen and Tony Sparano between Flores's retirement and Del Rio's arrival.