And he rejected the coup leaders' claims that mercenaries could be used.
"It's idiotic - no, it's not true at all," Mr Souare told the Associated Press news agency.
"We are still in control and we are trying to normalise the situation. We have no intention of bringing in mercenaries. In fact, we haven't even asked our own armed forces to intervene."
Mr Souare has been unable to communicate directly with the population since the dissident troops seized the state's TV and radio stations, AP said.
There are tanks on the streets of the capital, Conakry, but for the moment the city is calm.
The crisis began hours after the death of President Lansana Conte, when coup spokesman Capt Camara went on state radio to say that the government and other institutions had been dissolved in favour of a National Council for Democracy.
He said he would head a 32-member national council that would run the country.
Coup leader Capt Camara makes a television address
Later, he said the council would hold "free, credible and transparent elections" in December 2010, when President Conte's term would have ended.
"The council has no ambitions to hold on to power. The only reason is the need to safeguard territorial integrity. That is the only reason. There is no ulterior motive," he said.
However, there also appears to be disagreement among the plotters as to whether Capt Camara should head the new national council.
Many analysts had predicted the army would try to take over following President Conte's death because he had been increasingly relying on it to shore up his oppressive rule, our correspondent says.
In recent years he was in such poor health it was often difficult to know who was in charge.
President Conte died on Monday night after a "long illness".
The cause of his death is unknown, but Mr Conte, 74, was a chain-smoker and diabetic who is also believed to have suffered from leukaemia.
The African Union, European Union and United States led condemnation of the coup.
President Conte came to power in 1984 at the head of a military coup to fill the vacuum left by the sudden death of his predecessor, Sekou Toure, who had been president since independence from France in 1958.
He eventually oversaw a return to civilian rule and was elected three times, although critics said the votes were never free or fair.
A power struggle in the army could be extremely dangerous given the country's ethnic divisions, says the BBC's West Africa correspondent Will Ross.
Guinea's neighbours - Liberia, Sierra Leone and Ivory Coast - are enjoying relative stability after years of conflict, and there are fears any unrest in Guinea could spread.
Although Guinea's mineral wealth makes it potentially one of Africa's richest countries, its population of about 10 million is among the poorest in the region.
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