Charles will be visiting the club following nine seasons in Kansas City and one in Denver in 2017. The 31-year-old Charles had 69 carries for 296 yards to go along with 23 receptions for 129 yards receiving last season with the Broncos.
A four-time Pro Bowl selection, Charles was released by Kansas City in February 2017 after becoming the Chiefs' career rushing leader.
The Saints are looking for depth with running back Mark Ingram set to begin the season by serving a four-game suspension for violating the league policy for performance-enhancing substances. The former Heisman Trophy winner will be eligible to return to the Saints' active roster on Monday, Oct. 1.
Ingram was selected to his second Pro Bowl last season after rushing for career highs in yards (1,124) and touchdowns (12). He also caught 58 passes for 416 yards.
New Orleans has a capable replacement in electrifying Alvin Kamara, who was named the NFL Rookie of the Year last season.
Kamara rushed for 728 yards and eight touchdowns, averaging 6.1 yards per carry, and also amassed 81 receptions for five more scores.