Tyson Gay's former coach Jon Drummond is taking legal action against the athlete and the United States Anti-doping agency.
Drummond is alleging that he has been falsely accused of supplying Gay with the drug which he tested positive for last year, reports The Telegraph.
Gay tested positive for the anabolic steroid drug three times, and subsequently banned from the sport for one year. The length of the suspension was lower than the usual two years because of Gay's cooperation.
It has since, however, been revealed that USADA were seeking to ban Drummond from athletics for life for his role in the incident.
Drummond stringently denies any involvement in the scandal, though. Mark Whitburn, one of the coach's lawyers, was quoted as telling the Fort Worth Star-Telegram newspaper: "Mr Drummond was a proponent for clean competition when he was an athlete and a coach. He categorically denies any wrongdoing."
The American, part of the team which won 4X100m gold in the Sydney Olympics in 2000, had worked with Gay from 2007-2012, a period of success for the sprinter.
During this time, Gay won three World Championship gold medals in Osaka, as well as becoming the second-fastest man ever with a time of 9.69s. He also won silver in the 4X100m relay at London 2012, but handed the medal back as a result of the failed test.
Throughout everything Drummond has maintained his innocence, and will now hope the legal action clears him of any wrongdoing.
Write for GiveMeSport! Sign-up to the GMS Writing Academy here: http://gms.to/1a2u3KU