Justice Minister Frances Fitzgerald is today expected to receive approval to take in over 500 migrants for resettlement.
Ms Fitzgerald is bringing proposals to Cabinet in response to the growing migrant crisis in the Mediterranean.
Sources said she will seek resettlement for at least 520 migrants - more than double the figure announced earlier this year.
Defence Minister Simon Coveney is also expected to brief colleagues on the work of the crew abroad LÉ Eithne, which has been involved in a number of rescue missions in recent days.
Since its deployment in the last month, the naval ship has rescued more than 1,150 people.
Most migrants embark from Libya in unsuitable crafts.