"It's good to be back with him, he's a good man, a good coach," Del Rio said of Fox at his introductory news conference Monday. "I know the types of things he's looking for."
Del Rio said Monday he's energized after spending the last couple of months away from football. He went 69-73 in eight-plus seasons with the Jaguars, including 1-2 in the playoffs.
"I'm very appreciative of the time I had (in Jacksonville) ... I find myself rejuvenated," Del Rio said. "I'm very excited about the opportunity here."
The Jaguars owed Del Rio $5 million and will pay him the difference between that total and his new salary in Denver.
The Associated Press contributed to this report.