Two of the state quarantine cases had come from Portugal, two from the US, and one each from France, Germany, the UK, the UAE, Ukraine and Nigeria.
A Cambodian who had crossed over from Malaysia was also found to be infected.
As of Saturday, the number of confirmed cases in Thailand had risen to 23,134 since the outbreak. Of these, 20,605 had been contracted locally, including 13,236 who were found via proactive testing, while 2,529 were returnees.
So far, 16,274 (up 943) have recovered and been discharged, 6,781 patients are still in hospital and 79 have died.
According to Worldometer, as of 10am on Saturday, the number of confirmed cases globally had risen to 105.9 million (up by 481,790), 77.52 million have recovered, 104,997 in severe condition and 2.3 million have died (up by 14,246).
Thailand ranks 115th on the global list of most cases, which is topped by the US with 27.4 million, followed by India 10.81 million, Brazil 9.44 million, Russia 3.93 million and the UK 3.91 million.