You can check online to see if you need an entry visa to visit Portugal. If you require a visa, it is recommended you apply for one at least six weeks before you travel. We can provide you with an invitation letter upon request after you have registered for RIPE 90.
Portugal is within the Schengen area. You may require a transit visa if you are travelling to Poland via a country that is not within the Schengen area. Your airline should be able to provide you with transit visa information where required. There is a list of Portuguese embassies that can help you apply for a visa.