Tyson Gay has been handed a one-year ban for testing positive for anabolic steroids last June and has been stripped of his Olympic 4x100m silver medal won at London 2012.

The American sprinter could return to competition from June after his punishment was reduced from a nominal two-year suspension after he provided substantial evidence to the United States Anti-Doping Agency throughout their investigation.

Gay's results achieved since July 15 2012, the date he first admitted to using the prohibited substance, have been abolished from the records however he will return to the sport as the joint-second fastest 100m of all time.

USADA chief executive Travis Tygart said: "We appreciate Tyson doing the right thing by immediately withdrawing from competition once he was notified, accepting responsibility for his decisions, and fully and truthfully cooperating with us in our ongoing investigation into the circumstances surrounding his case."