TOKYO -- A Tokyo government panel reviewing the cost of hosting the 2020 Summer Olympics is set to propose moving more venues outside of the city in order to save money.

Among the venues being reviewed are those for volleyball, swimming, rowing and canoe sprint, Kyodo news agency reported Wednesday.

The panel was set up earlier this month by Tokyo Governor Yuriko Koike, who is keen to reduce the ballooning costs.

Details of the proposed changes are expected to be made public Thursday at a meeting of a taskforce for metropolitan government reform.

Tokyo won the right to host the games by promising a compact bid with 28 of the 31 competition venues within an eight-kilometre (5-mile) radius of the Olympic and Paralympic Village.

Originally, only shooting, modern pentathlon and one football venue were to be outside the eight kilometre radius.

Already, venues for basketball, taekwondo and cycling have been shifted outside of Tokyo to maximize existing facilities. Cycling was moved to Izu, some 145 kilometres (90 miles) southwest of the Japanese capital.

Tokyo 2020 organizing committee president Yoshiro Mori acknowledged in July that the cost of building seven temporary venues for the Olympics has surged to an estimated $2.6 billion, up from an initial estimate of $690 million.

Mori said the original figures were the result of sloppy calculations which he blamed on the Tokyo metropolitan government and the Japanese Olympic Committee.

The organizing committee hasn't disclosed an official estimate of the overall costs but has acknowledged it will be considerably higher than the $3.5 billion that was forecast in the bid.

Preparations for the 2020 Games have been plagued by a series of scandals involving the new national stadium, the official logo and allegations of bribery in the bidding process.

Work on the new national stadium has fallen behind schedule because the government abandoned an original design amid spiraling costs.

The total costs for staging the Tokyo Olympics are shared by the organizing committee, the Tokyo municipal government and the national government.