The Portuguese Government has announced that on Monday (May 17) Portugal will allow entry to tourists from UK and EU countries with “less than 500 cases of infections per 100,000 people”, but “passengers must show a negative coronavirus (PCR) test on arrival” and done at most 72 hours prior to traveling. More details in links below.
News Source:
https://news.yahoo.com/portugal-allow-eu-uk-tourists-114237783.html
Website of the Portuguese Tourism Office:
https://www.visitportugal.com/en/content/covid-19-measures-implemented-portugal
Website of the Portuguese Borders Police:
https://imigrante.sef.pt/en/covid-19/faqs/#1596230859073-a1cdfe6a-4ada