Dwain Chambers has technically qualified for the Beijing Olympics but must wait until Wednesday to find out if he can actually go.
The sprinter won the 100m at the Olympic trials in Birmingham on Saturday in 10 seconds exactly.
But because he took drugs to improve his performance in the past, he is banned from taking part in the Olympics for life.
He's going to court on Wednesday to try to overturn the ban.
Chambers feels that the ban isn't fair because the UK is the only country which has one for drugs cheats.
Dwain in action
If he lived in America or Spain, for example, he would be allowed to compete in Beijing.
But many people in athletics, think he shouldn't go to the Olympics because of his drug cheating past.
Lots of top athletes, including Dame Kelly Holmes and Sir Steven Redgrave, have signed a petition saying they don't want him to be allowed to compete.