No infected person has been found yet.
Phuket Provincial Health official Dr Khajornsak Kaewjaras yesterday said that three out of six at-risk travellers had been located and were given the all-clear after 21 days of being monitored.
Phuket authorities are trying to get in touch with the other three visitors.
The southern province has set up a centre at Vachira Phuket Hospital for suspected Ebola cases from visitors who arrive at Phuket Airport.
According to the World Health Organisation, as of last Tuesday 3,069 people had been infected with the disease and 1,552 had died in Guinea, Sierra Leone, Liberia and Nigeria.