Earlier this month, the court ruled that Lebedev's former business partner, jailed Yukos founder Mikhail Khodorkovsky, be kept in a pre-trial detention center until February 9, 2009.
Both Khodorkovsky and Lebedev are serving an eight-year jail term for fraud and tax evasion. In early July, Russian prosecutors brought new charges against them of laundering $28.3 billion and stealing oil between 1998 and 2004.
Last week, the board of the Chita District Court in East Siberia rejected an appeal against a lower court decision to deny parole to Khodorkovsky.
Both Lebedev and Khodorkovsky have consistently maintained their innocence. Khodorkovsky claims that he has been punished for supporting the country's pro-Western opposition, and that the subsequent liquidation of Yukos was engineered by corrupt government officials aiming to seize lucrative oil assets.
The jailing of Lebedev and Khodorkovsky, head of what was once Russia's largest independent oil producer, has been widely criticized in the West.
