"Thaksin has prepared and is ready for that, even though no direct accusation has yet to be made against him. All the matters against him are now just allegations," Noppadol told AFP.

The billionaire businessman's trip to Beijing from London last week came amid swirling rumors that negotiations were underway to secure permission for his return to Thailand.

Local media reported Monday that security had been stepped up along the Thailand-Laos border amid further rumours that Thaksin may try and slip back into Thailand via the Golden Triangle.

However Noppadol dismissed such reports and said that Thaksin had no plans to return to the kingdom in the near future.

"He has no immediate plan or has even approached anyone here to come back to Thailand. He will consider returning when the situation has returned to normality,one the martial law is lifted," Noppadol said.

Thaksin was in New York at the time of the coup in September, and had since been living in self-imposed exile in London where he has a home.

Agence France Presse