Connacht have been granted a meeting with Leinster, Munster, Ulster and IRFU officials next week.
Browne added the IRFU may seek outside consultants to carry out a review of Ireland's pool-stage exit.
"It has been a huge disappointment not only for the public but also for the IRFU, " he added.
The IRFU has criticised the WRU for failing to "consult its partners" prior to committing to the Anglo-Welsh Cup.
The review concluded management, players and the IRFU should all accept "individual and collective responsibility" for the poor showing.
Cecil Watson, president of the IRFU Ulster Branch, said the recruitment process had "attracted a high level of quality applicants".
"The IRFU gave me the four years because they want me to do the job for four years, " said O'Sullivan.
The Ulster Branch of the Irish Rugby Football Union (IRFU) had ruled out the use of Ravenhill earlier this month.
The IRFU has thrown their weight behind O'Sullivan, who must be glad that in the main, there is centrally-controlled contracts.
BBC: SPORT | Rugby Union | Six Nations | O'Sullivan keeps his powder dry
Browne said the IRFU would not be rushed into any decision regarding O'Sullivan and defended Ireland's preparations going into the competition.
"The Scottish and Irish rugby unions are disappointed given the serious negative consequences it has on the Celtic League, " said an IRFU spokesman.
Connacht officials have contacted the IRFU and the Irish governing body is believed to have sought clarification from the IRB on the matter.
BBC: Connacht shocked by doubts over duo's Irish eligibility
"The FAI has met all of its contributions to the 411m Aviva stadium which it jointly owns with the IRFU, " added the FAI.
The review, assisted by the Genesis consultancy group and the Irish Rugby Union Players' Association, was presented to the IRFU 22-man committee on Monday.
Blind-side flanker Stephen Ferris replaces the suspended Alan Quinlan but the Munster player could still make the bench if an IRFU appeal is upheld.
''The new position we are offering Declan is a key role in the future of rugby in Ireland, '' said IRFU Chief Executive Philip Browne.
While obviously wanting his star players available, Ulster coach Alan Solomons said that everything was in the hands of the IRFU, and he will stick by their decision.
An IRFU statement said that the squad included players who have "recently made their returns from injury or who will be looking to increase their competitive game time ahead of the Six Nations".
The review appears, temporarily at least, to ease the pressure on head coach Eddie O'Sullivan and deflect further criticism from the IRFU's three-man committee which gave him a bew four-year contract before the World Cup started.
"We expect the IRFU to keep us informed of all developments in this matter and consult with the IRUPA before they make any decision which may directly and adversely affect the livelihood and careers of our members".
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