Sunday's anti-government rally is unlikely to draw many people, Deputy Prime Minister Chalerm Yubamrung said on Saturday.

Mr Chalerm also downplayed reports of discontent in the governing Pheu Thai Party ahead of a major cabinet shakeup.

Reports have suggested that some Pheu Thai members as well as senior red shirts are unhappy with the reshuffle, in which close associates of the Shinawatra family are tipped to gain even more influence.

Mr Chalerm also questioned the strength of the Pitak Siam movement, headed by Gen Boonlert Kaewprasit, who says his goal is to have Pheu Thai removed from power by any means.

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"If anyone in the party is at odds with Thaksin, that person would be left with just a body and a shadow," says Mr Chalerm (right) (File photos)

"I believe there won't be many people taking part in the protest tomorrow," said Mr Chalerm "At first, I thought people from Isan (the Northeast) would join in but the Isan people love Thaksin and Yingluck Shinawatra because they elected them."

He said Pitak Siam should call off the rally because it would hurt business and tourism. The rally is planned to be held at the Royal Turf Club in Bangkok.

He said the government would not resort to violent measures but the protesters must abide by the rule of law.

As for the cabinet reshuffle, the veteran politician said the names of the new ministers had not yet been decided.

He said there was nothing to be worried about and members of the Pheu Thai Party were not divided.

"If anyone in the party is at odds with Thaksin, that person would be left with just a body and a shadow," he said.

"You must know that the party's slogan is 'Thaksin Thinks, Pheu Thai Acts' and that Ms Yingluck is the prime minister.

"Thaksin might not be involved in the reshuffle but he's only the symbol."