The World Health Organization's Europe chief said the risk of the virus spreading into Europe would increase in spring and summer when temperatures warm up.
It is most likely to spread beyond Latin America by mosquitos stowed away in baggage, or in the blood of travellers.
The Aedes mosquito is rarely found in Europe, but health experts say it could survive in hotter southern countries if reintroduced there.
However, the mosquito is established on Madeira, according to the European Centre for Disease Prevention and Control (ECDC).
It caused a dengue fever epidemic - some 2,000 cases - on the Portuguese island in late 2012.
Aedes has also been found recently in the Netherlands - thought to have been imported on a shipment of tyres, as well as on the northeastern Black Sea coast.
Brazil has been worst affected by the Zika outbreak after detecting its first case in May, with nearly 4,000 cases reported so far.
It has quickly spread to more than 30 countries.
The virus - which is strongly linked to birth defects such as abnormally small heads and incomplete brain development - has been declared an international health emergency.
Women are being warned to avoid Zika-hit countries if they are pregnant or are thinking about becoming pregnant.
Zika has also been found in semen and a county in Texas has reported a sexually transmitted case of the virus.
With the exception of the risks for unborn babies, the virus is not considered dangerous.
About one in five people infected get relatively mild symptoms including a fever, muscle pain, red-eyes and a skin rash three to 12 days after being bitten.
Two people in Ireland who had travelled to a country affected by Zika have now recovered.
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