Tomlinson, the NFL's fifth-leading rusher, will re-sign with the Chargers on Monday before announcing his retirement at a news conference, the Chargers said on their website.
Tomlinson played his first nine seasons in San Diego and was named league MVP in 2006 when he set the single-season record with 31 touchdowns.
The last two years saw Tomlinson play with the New York Jets, helping them reach the AFC Championship game in the 2010 season.
He retires with 13,684 rushing yards and 162 total touchdowns, the third-most in the NFL, and is certain to be inducted into the Hall of Fame.
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