The United States Anti-Doping Agency (Usada) is seeking the maximum ban, but the actual length of it will be determined by an arbitration panel.
Gatlin, 24, was facing a life ban after testing positive for testosterone, his second doping offence, on 22 April.
But he has agreed to "co-operate in the effort to eradicate drugs from sport." The ban came into effect on 15 August, and is set to run until 24 July, 2014, unless it is overturned or reduced at the arbitration hearing.






