The Minister for Communications Richard Bruton is seeking a meeting with Eir and Imagine to assess what impact their plans might have on the intervention area.
The Minister was responding to the matter which was raised by Fianna Fáil's Communications spokesperson Timmy Dooley Topical Issues debate in the Dáil.
Mr Dooley told the Dáil that the state could end up paying a lot more for the National Broadband Plan following announcements by Eir and Imagine last week.
He asked the Minister Bruton if the final price and rollout of the plan would be influenced by the size of the intervention area, which covers houses that can't get broadband from commercial providers.
Mr Dooley said it was "absolutely clear" that the cost per household could go up "very significantly".
"If the intervention area shrinks by 400,000 overnight, what happens the cost to the state? Has the cost per household of the roll-out increased or decreased as a result of the announcements last week?".
The Minister said it would be untrue to assume the intervention area has been reduced to a particular level as a result of the announcements.
He also said that there is a considerable number of premises which the department has identified, in addition to the 84,000 households that were taken out before, where it was thought a commercial service would be delivered, but it does not now seem it will be delivered.