Congolese presidential hopeful Moise Katumbi has been sentenced in absentia to 36 months in prison.
The wealthy businessman, who owns one of Africa’s biggest football clubs, is currently out of Democratic Republic Congo seeking medical treatment.
The 51-year-old was found guilty of illegally selling a property in Lubumbashi, his eastern power base.
He had the backing of seven opposition parties to run for the presidency in elections due to be held in November.
President Joseph Kabila, in power since 2001, is nearing the end of his second term and he is constitutionally obliged to step down by December.
But there is growing political tension as it is not clear if he will relinquish power.
The court in Lubumbashi, DR Congo’s second city, also fined the football tycoon $6m (£4.1m) for illegally selling the property, which a Greek citizen claimed belonged to his family.