LONDON - Sprinter Dwain Chambers said on Tuesday he could launch a High Court appeal against his Olympic lifetime ban after running at a meeting in Greece on Wednesday.

Controversial sprinter Dwain Chambers, seen here in March 2008, was taking a cocktail of seven banned drugs when he was caught doping in 2003. The disgraced British sprinter informed UK Sport as he took the first step towards a legal bid to to be allowed to run in the Olympics. [Agencies]

Under British Olympic Association (BOA) rules Chambers, who has served a two-year ban for testing positive for the designer steroid THG in 2003, is banned from ever competing in the Olympics for Britain.

However, he has not given up hope of running in Beijing in August and says he is ready to challenge the BOA.

"I have to do this - I can't afford to wait if I want to compete in the Olympics," Chambers told Web site Inside the Games. "It is the first step on the legal ladder."

Chambers, who made a controversial return to the British team at the world indoor championships earlier this year when he took a silver medal in the 60m, will run his first 100m for two years in Kalamata on Wednesday.

He recently spent a short time at rugby league club Castleford and has also tried his luck in American Football as he seeks to pay back prize money earned while he was on drugs.

"I've got to fight for what I believe in," added Chambers. "This is what I'm good at, it's what I do. I've got a lot of support. I've had nothing but encouragement from the public."

British 400m runners Christine Ohuruogu is free to compete in Beijing after winning her appeal against the BOA ban after she was sanctioned for missing three doping tests.