The checks, which will include biometric screening, will take place at camps in Italy and Greece before refugees are relocated here, Department of Justice officials said.
“Ireland will be carrying out security checks in the countries concerned before the applicants are relocated to this country,” a spokesman said.
Officials said the strict vetting had always been planned and was not a response to the terrorist attacks in Paris.
Migrants are being processed at centres in Italy and Greece before being assigned to other EU countries.
However, they can also be deported if they are rejected.
The rigorousness of the vetting plans has emerged as a huge issue, since it emerged a passport found near the body of one of the Paris attackers belonged to a man who arrived on a Greek island after fleeing from Syria. Ireland is set to take up to 4,000 people as part of the EU’s response to the refugee crisis in the war-torn region, with the first group of around 20 set to arrive by the end of the year.
It was initially thought up to 500 would be here by Christmas, but the process has been slowed significantly due to migrants refusing to apply for asylum, fearing they may be forced to remain in Italy or Greece rather than progressing to elsewhere in Europe.