Bryan Namoff, a long-serving D.C. United defender whose career was cut short by a concussion three years ago, filed a $12 million lawsuit Wednesday against the MLS club and former coach Tom Soehn, claiming they failed to properly evaluate his injury and cleared him to play too soon, reports Steven Goff.

The complaint alleges United was “negligent in its management, care and treatment” of Namoff after he was injured in a game at RFK Stadium on Sept. 9, 2009. He played three days later, which ultimately was the final appearance of his nine-year career.

United spokesman Doug Hicks said the club wouldn’t comment on pending litigation.

Namoff, now 33, says he suffered brain damage and cognitive, memory and sensory loss. He also has permanent headaches and fatigue, sleep problems and hypersensitivity to motion, the lawsuit says.