Jamaal Charles

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Denver Broncos running back Jamaal Charles, back center, is surrounded by reporters as he talks after taking part in drills at NFL football training camp Friday, July 28, 2017, in Englewood, Colo. (AP Photo/David Zalubowski)

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Denver Broncos running back Jamaal Charles takes part in drills at NFL football training camp Friday, July 28, 2017, in Englewood, Colo. (AP Photo/David Zalubowski)

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Denver Broncos running back Jamaal Charles, center, gets a shot of water from a field worker as fullback Andy Janovich looks on during drills at NFL football training camp Thursday, July 27, 2017, in Englewood, Colo. (AP Photo/David Zalubowski)

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Denver Broncos running back Jamaal Charles tests his left knee during drills at NFL football practice, Thursday, June 15, 2017, at the team's' headquarters in Englewood, Colo. (AP Photo/David Zalubowski)

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Denver Broncos running back Jamaal Charles takes part in a drill during the team's NFL football minicamp session Monday, June 5, 2017, in Englewood, Colo. (AP Photo/David Zalubowski)

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Denver Broncos running back Jamaal Charles stretches as players take part in drills during an NFL football minicamp session at the team's headquarters Tuesday, May 30, 2017, in Englewood, Colo. (AP Photo/David Zalubowski)

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FILE- In this Oct. 11, 2015, file photo, Kansas City Chiefs running back Jamaal Charles carries the ball during the second half of an NFL football game against the Chicago Bears in Kansas City, Mo. Charles is scheduled to visit with the Denver Broncos on Tuesday, May 2, 2017. If his surgically repaired right knee checks out, Charles could be joining their fierce divisional rival. (AP Photo/Ed Zurga, File)

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Kansas City Chiefs running back Jamaal Charles (25) listens to coach Andy Reid during NFL football training camp Sunday, July 27, 2014, in St. Joseph, Mo. (AP Photo/Charlie Riedel)

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Philadelphia Eagles DeSean Jackson (10) of Team Sanders celebrates with teammates Kansas City Chiefs running back Jamaal Charles (25) and Dallas Cowboys wider receiver Dez Bryant (88) after Jackson caught a pass for a touchdown in the first half during the Pro Bowl, Sunday, Jan. 26, 2014, at Aloha Stadium in Honolulu. (AP Photo/Eugene Tanner)

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Kansas City Chiefs running back Jamaal Charles, left, Houston Texans defensive end J.J. Watt, center, and Hall of Famer and alumni team captain Deion Sanders, right, check their notes during day two of the 2014 Pro Bowl Draft, Wednesday, Jan. 22, 2014, in Kapolei, Hawaii. (AP Photo/Eugene Tanner)