BBC SportOlympics

Chambers has been widely condemned on his athletics return

Chambers' lawyer Nick Collins told BBC Sport he could take his case to compete in the Beijing Games to the High Court.

Under British Olympic Association (BOA) rules, the sprinter is banned from the Games after he tested positive for performance-enhancing drugs in 2003.

But an advisor said Chambers is focused on running the 60m event in Valencia.

Damion Silk, who is acting as the 29-year-old's public relations spokesman, said he will not be making any further statements on an appeal case until after conclusion of the three-day indoor championships on 9 March.

The Londoner had missed the BOA's 15 February deadline for to lodge an appeal against his ban, ruling him out of representing Great Britain in this summer's Games.

But Collins said Chambers had only been given short notice of the BOA's deadline, but revealed he would be keeping his options open.

"I was with Dwain and we had a long and productive meeting and he is in very good spirits and is not going to rush into any decision regarding his appeal," he said.

"Dwain is focused on his training and on competing in Valencia and he wants to do well for his country."

No British athlete has gone to the High Court before to take on the BOA over a lifetime ban and Chambers would be the first to do so.

However, if Chambers opts to try to overturn his ban in the courtroom, he could face an enormous legal bill for his troubles.

He already owes the International Association of Athletics Federations �100,000 from prize money he had earned while using steroids.

Collins refused to comment on how Chambers will fund any legal case.

Chambers has been controversially included in Britain's squad to run in the 60m, despite UK Athletics' reluctance to select him.

He was banned for two years after he tested positive for tetrahydrogestrinone (THG)

After a brief career in American Football in Europe, Chambers returned to athletics for a second time and won the 60m sprint at the world indoor trials on 10 February, a victory which earned him an automatic slot in the British team.

Chambers has already been hit by various snubs from future domestic and world athletics meets, as well as condemnation from administrators and former athletes.

Former Olympian and 100m runner Allan Wells threatened to sever ties with the BOA if Chambers was given the green light to compete in Beijing.