U-T San Diego first reported Dielman's intentions Tuesday.
Dielman, a four-time Pro Bowl pick, was an anchor of the Chargers' line, but he finished the 2011 season on injured reserve because of a concussion. Dielman, 31, suffered a concussion against the New York Jets in October and later suffered a seizure on the flight back to San Diego.
Dielman had said he wanted to continue playing, but doctors reportedly advised him his quality of life would be better if he retired now.
According to U-T San Diego, Dielman was due a $1 million roster bonus next month and a $4.5 million base salary in the final year of his contract.