He confirmed that one patient in a quarantine facility tested positive to the coronavirus on Wednesday night.
However, Tuila'epa said a second confirmatory test came back negative when conducted this morning.
The man was a sailor who arrived in Samoa on a repatriation flight from Auckland on Friday, November 13.
He has been placed in an isolation ward at Tupua Tamasese Motootua hospital.
The Prime Minister said the country would not take any chances as the man could transmit the coronavirus to others.
Seventeen sailors, who had been stranded at overseas ports, arrived on the Friday flight and have been in quarantine with the close to 300 passengers.
Tuila'epa urged people not to panic and to heed advisories from the National Emergency Operations Centre and the Ministry of Health.
"Let us keep the faith and wear masks and wash our hands as advised," he urged.
Officials have started the contact tracing process.
The Cabinet is meeting this afternoon to consider further safety measures as well as to review the first repatriation flight from Los Angeles next Friday.
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"The man was a sailor who arrived in Samoa on a repatriation flight from Auckland on Friday, November 13", wasn't there also ministers from New Zealand who traveled there as well, how many of them isolated for two weeks when they arrived?.