According to the UK's Office of National Statistics (ONS), there are around 20,000Goansholding Portuguese passports who live and work in the UK.
They used their right of freedom of movement within the EU to settle in Britain over the years but now fear their immigration status could change after the referendum in the event of a British exit from the European Union.
The association, founded in 1966 as a cultural and professional hub forGoansacross UK and Europe, saidGoansin India in the process of applying for their Portuguese passports have also been affected.
"There were manyGoansmid-way through this process suddenly left unsure about their future. They may have applied after narrowing down job opportunities here but are now no longer sure what the future would hold in the UK," he said.
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They are mostly employed within the catering and hospitality sector in customer service roles or as chefs but also as IT professionals and labourers.
"Most of theGoansbased here are professionals who come with a particular skill set or are entrepreneurs. They have moved here to improve their circumstances and not for the benefits system. In the event of changes following the referendum, they will still be part of the EU and may look at going to Germany or France or other EU countries that have job opportunities," said Flavio Gracias, aGoanwho has been based in London since 1968.
The region was ruled by the European nation for nearly 450 years before it officially became a part of India in 1961.
According to data from the Election Commission of India, 11,500Goanssurrendered their Indian passports in favour of Portuguese citizenship in the five years between January 2008 and January 2013.
This figure is now estimated to be closer to 24,000, many of whom have settled in the UK.