The daa has disputed the need for a third terminal at Dublin Airport 'in the medium term'.
It comes after Transport Minister Shane Ross said a third terminal is "on the table" for the airport.
A capacity review of the county's airports has been published by the Department of Transport.
Commenting on the report, Minister Ross said he was "acutely aware" of the dependence of the national economy on Ireland's airports, particularly Dublin.
"I want to ensure that there is an open approach to the policy options for expansion of Dublin Airport and specifically an examination of the merit of introducing competition in the provision of terminal services.
"The report confirms that this is a possible option.
"I will now seek to establish the views of key stakeholders before considering the matter further and deciding a way forward."
Transport Minister Shane Ross at the launch of the drink-driving disqualification and October bank holiday weekend campaigns | Image: Sam Boal/RollingNews.ie
"Irish airports, and Dublin Airport in particular, have experienced a strong return to growth in recent years and this growth is expected to continue.
"In order to ensure that the airports are prepared for the longer term, this review looks to the future needs of the three state airports to 2050."
DAA: 'No new terminal in the medium term'
In response, the daa said it has started formal consultations on a capital investment programme for Dublin Airport.
It includes a €900m capacity plan to help the airport grow to 40 million passengers a year.
The daa is proposing to invest about €400m between 2020 and 2024 to deliver new capacity in the northern end of the airport close to Terminal 1, while about €500m will be invested close to Terminal 2.
This is to deliver new boarding gate areas, aircraft parking stands and other improvements.
On any prospects of a third terminal, the daa said its position "has been consistent over the past two years".
"The airport urgently requires a new runway, new boarding gate piers, aircraft parking stands and other improvements rather than a new terminal in the medium term.
"This view is held not just by daa, but also by its main airline customers at Dublin Airport.
"In this context, daa welcomes the fact that the Oxford report states that 'the incremental expansion of Terminals 1 and 2 is desirable' so investment in new capacity should continue.
"daa's key priority at Dublin Airport is to press ahead with its major programme of investment works to address capacity issues and meet the needs of our airline customers."
The review has also looked at existing/planned airport capacity and identified priorities.
It also recommends timeframes for new or adjusted infrastructure to pre-empt any capacity constraints at Cork and Shannon.
The minister is inviting the views of all interested parties on the findings of the review through a public consultation process which will take place between now and the end of the year.
Minister Ross has undertaken to consider all submissions, before reverting to Government in early 2019 with recommendations on the future development of Dublin Airport.
The review concludes that how passengers get to and from Dublin Airport in the future will be critical to any decision on terminal development.
The full report is available here