The 32-year-old Scot served a two-year ban between 2004 and 2006 after admitting to taking the banned blood booster Erythropoietin (EPO) and under the rules of the British Olympic Association (BOA) that means he is automatically suspended for life from the Games.

He had hoped that the door would have been opened for him when sprinter Dwain Chambers challenged the rule in the High Court last year but his appeal was unsuccessful.

Millar said: "I obviously followed it, but it was a bit rushed, because it was last minute.

"It will be interesting to see how it develops, if that is challenged on a legal basis."

Millar, who was stripped of his 2003 world time trial title after he admitted having cheated, may now try to overturn the rule himself.

He said: "I did a two-year sanction and basically I've been banned from two Olympics.

"At the moment it [the Olympics] is impossible, but we'll see what happens.

"We'll go another year or so and see if I should take action or not."

Millar, who competed for Britain in the Sydney Olympics in 2000, has earned worldwide praise for his efforts to rehabilitate himself since returning to the sport.

He is now a member of the World Anti-Doping Agency Athletes' Commission and a strong advocate for drug-free sport.

Millar never tested positive but was suspended after two syringes were discovered in his flat afer a police raid.

Millar said: "I'm very proactive and I'd like to think that could perhaps contribute to me doing the Olympics again before I retire.

"I'm a big believer of giving people second chances, for obvious reasons.

"I think that's the way it should be.

"I've paid my price.

"If I have the will, I'll find a way to get back at the Olympics."