The chairman of the British Olympic Association (BOA), Colin Moynihan, has urged the Court of Arbitration for Sport (CAS) to reject a challenge to their policy of a lifetime Olympics ban for drugs cheats.
The World Anti-Doping Agency (WADA) has brought a case against the BOA, which is the only sporting body to impose such a ban, claiming that it contravenes their anti-doping code.
A decision in WADA's favour could see Britain's former European 100 metres champion Dwain Chambers and cyclist David Millar eligible for selection for this year's Olympics in London.
Chambers, who won bronze in the world indoor 60m in Istanbul on Sunday, was banned for two years after testing positive for the anabolic steroid THG in 2004 while Millar has also served a doping ban.
The court is due to give its ruling next month.