Dwain Chambers and other British drugs cheats could be cleared for London 2012 by April after the Court of Arbitration for Sport finalised a hearing into their lifetime Olympic bans.
Sprinter Chambers, 33, has served a ban for a positive test in 2003, but is still barred from the Olympic team by a British Olympic Association bylaw.
The World Anti-Doping Agency claims the BOA ban conflicts with its code.
The case will begin at Cas on 12 March with a verdict expected the next month.
The London 2012 athletics team is due to be selected in early July following trials.
The BOA argues that a clean drugs record is also part of its team selection criteria rather than an additional punishment on those who have failed tests in the past.
Chairman Lord Moynihan has insisted that should the rule be changed by Cas's decision, then Chambers and others who would become eligible would be welcome back into the fold.
Chambers was the fastest Briton over 100m last year, clocking times of 10.10 seconds or less on seven occasions - well inside UK Athletics' A qualification time of 10.18.