Dwain Chambers looks set to be selected for team Great Britain when the the athletics squad is announced on Tuesday.
It marks the end of a long saga for the 34-year-old's bid to compete in the Olympics again, 12 years after his last appearance.
Chambers was banned from competing at the Olympics for life by the British Olympic Association (BOA) in 2003, after he tested positive for the steroid THG.
But a ruling by the Court of Arbitration for Sport two months ago, said that the BOA's policy was illegal, and Chambers was cleared to race at the Games.
He then had to qualify, and his win at the 100 metre trials at the Olympic trials in Birmingham went a long way to sealing his place.
He will now have the chance to potentially race against defending champion and world record holder Usain Bolt in London this summer.