Another lockdown may be considered to slow the spread of Covid-19 if new cases continue to surge, National Security Council secretary-general Natthapol Nakpanich has said.

His comments coincide with the Centre for Covid-19 Situation Administration (CCSA) not ruling out the possibility of new cases soaring to 10,000 per day next week given the rapid rise of the highly transmissible Delta variant.

Gen Natthapol Nakpanich, head of the CCSA's operation centre, said the CCSA would be willing to consider any proposal from the Ministry of Public Health for a lockdown to contain Covid-19 transmissions.

He said he had heard talk of a lockdown. There was no official proposal so far, but if proposed, the centre was ready to consider it.

"People should have a correct understanding of the term 'lockdown'. Measures, which included a curfew, taken by the government in April last year could be construed as a lockdown, but the restrictions imposed afterwards -- such as the shuttering of businesses and a ban on movement of people -- were not," he said.

Asked whether the matter would be raised at the CCSA's July 12 meeting, Gen Natthapol said it could come sooner if the number of infections and deaths went up.

"We may wait for 15 days to assess the situation," Gen Natthapol said. "We have to take all factors into consideration.

"In the meantime, we have to look into other matters, such as controls on the movement of people and solving the problem of bed shortages. We won't just sit and watch the figures."

Asked whether a lockdown would be imposed only in areas where the Delta variant of the Covid-19 virus was rampant, or for the whole country, Gen Natthapol said emphasis would be placed on Bangkok and surrounding provinces, along with the four southern border provinces. Other parts of the country could be put under semi-lockdown.