ENGLEWOOD, Colorado (AP) " Declaring "I still have more in my tank," the Kansas City Chiefs' all-time rushing leader Jamaal Charles signed with the AFC West rival Denver Broncos on Tuesday for a chance to prove it.

"Excited to have Jamaal Charles join the Broncos," general manager John Elway tweeted Tuesday after signing Charles to a one-year, incentive-laden deal. "A great addition to our backfield, and we're thrilled we won't have to play against him!"

Charles played in just eight games over the last two seasons after tearing his right ACL in October 2015, leading the Chiefs to cut him this winter.

Charles posted videos online of his workouts to show how primed he is for a comeback at age 30.

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"I still can keep up with the young people," Charles said. "So, I feel I still have more in my tank."

Charles ran for 7,260 yards and 43 touchdowns in nine seasons with the Chiefs. He added 2,457 yards receiving and 20 TD catches. But a career that looked as if it would land Charles in the Hall of Fame was derailed the last few years by injuries that cut short several seasons in his prime.

He tore his left ACL while taking an awkward step out of bounds in Detroit in 2011. He tore his right ACL against Chicago four years later. After missing the start of last season, Charles returned to play in only three games, carrying 12 times for 40 yards, before requiring more operations on his knees.

The Chiefs cut the four-time Pro Bowl running back to clear more than $6 million in salary cap space so they could focus on solidifying their O-line and keep the heart and soul of their defense " All-Pro safety Eric Berry.

At the NFL combine in March, Chiefs GM John Dorsey and coach Andy Reid reminisced about Charles, saying they believe he'll be enshrined in Canton one day.

"Jamaal Charles, to me, is one of the finest football players to ever play in the National Football League," Dorsey said. "These are hard decisions to make when you have a player of that magnitude and that caliber."

"One of my favorite guys I've had a chance to coach," Reid said at the combine. "You know, he's not a very big guy but he's fearless, he ran inside, had the speed outside, world-class speed to turn the corner. Had great hands and on top of that he's a great kid and just dirty tough. ... But we all do get older and that's the way the National Football League is."

When he cut him, Dorsey wished "Jamaal and his family the best of luck in their next step."

That's in Denver, where Charles, whose 5.5-yard career rushing average is the best in NFL history, will get two cracks at his former team: the Broncos visit the Chiefs on Oct. 30 and host them Dec. 31.

"I'm just happy I get to play them twice a year," Charles said.

Charles joins a backfield that was bruised and battered last year and was unable to keep pressure off the Broncos' young quarterbacks and wide receivers.

C.J. Anderson, IR by Kapri Bibbs and fullback Andy Janovich all missed large parts of the season with injuries. Rookie Devontae Booker, who was coming off two knee surgeries, led the team with 612 yards rushing and four TDs.

As a group, the Broncos averaged 92.8 rushing yards, ranking 27th in the NFL, a big reason they failed to make the playoffs a year after winning the Super Bowl.

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