Sproles was scheduled to become an unrestricted free agent this spring before the Chargers opted to use their franchise designation him, which guarantees he'll make the average of the five top running back salaries in the league. It's a total of $6.621 million this season.
If another team were to sign Sproles, the Chargers would have received two first-round draft choices as compensation.
A year ago, Sproles was one of the game's most electrifying players. He averaged 5.4 yards per carry and 11.8 yards per reception and scored six touchdowns in his fourth NFL season.
In addition to his role on offense, Sproles serves as the team's primary return specialist. He finished eighth in the NFL in both kickoff return average (26.0) and punt return average (11.3).
In an unrelated roster move, the Chargers added Georgia cornerback Ramarcus Brown to the roster Tuesday and released cornerback Grant Mason.
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