Pakistani opposition leader Imran Khan, who tried to oust Prime Minister Nawaz Sharif in a row over offshore wealth, has acknowledged using an offshore company to avoid paying British tax on a London property sale.

Analysts say the admission is likely to ease the pressure on Sharif's government from a Panama Papers data leak that showed Sharif's children had used offshore companies to buy London properties. Last month the government bowed to opposition demands for a review by an independent commission.

Khan's PTI party initially denied media claims that he bought a property in London through an offshore company in 1983, when he was playing cricket in England. But late on Friday, Khan said he set up the company to legally avoid paying British taxes.