Dwain Chambers has hinted he could retire after securing a silver medal in the World Indoor Championships.
The controversial sprinter set a new personal best with a time of 6.54 seconds to finish behind Nigeria's Olusoji Fasuba in the 60m final.
And as the British Olympic Association (BOA) still oppose his participation in Beijing this summer, he told BBC Sport: "There may not be a return after this.
"If there's not a chance to go forward, I'll go and pursue a career elsewhere."
Quitting athletics would cap a remarkable few months for the 29-year-old Londoner.
Chambers arrived at the World Indoors under a cloud of controversy having been banned from the sport for two years for knowingly taking drugs in 2003.
His inclusion in the Britain squad was derided by former and current members of the team, but few could deny his fantastic performance in Valencia as he shared the silver medal with former world 100m champion Kim Collins.
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However Chambers refused to rule out appealing against his lifetime Olympic ban imposed by the BOA.
"I want to check my situation, check if it's worth appealing and if there's a chance of me winning then it's something we will consider," he said.
"But for now I just want to celebrate with my team-mates and go and have some fun. I can't please everybody, but I got a medal for my country and I'm happy."
UK Athletics reluctantly picked Chambers because of his previous drugs offence.
UKA chief executive Niels de Vos says the organisation are still looking to ensure that in future it does not have to pick an athlete with a doping offence to their name.
"This is obviously a spectacular personal success for Dwain which has shown that he is one of the most naturally gifted sprinters in the world," said De Vos.
"His success and his welcome public commitment to drug-free sport does not alter our commitment to review our policy towards athletes returning from a drugs ban, in line with the changing policies of others within the world of athletics."
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