Stormont still does not know how much Casement Park will cost despite the unbuilt stadium being part of a bid to host Euro 2028.
The bill was last estimated at around £112million more than three years ago - but no official update has been given since then.
Costs are expected to have increased due to delays in planning approval, construction inflation and design changes.
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But Ulster GAA "has not yet finalised this updated cost", Stormont's Department for Communities told Belfast Live.
The long-delayed stadium redevelopment in West Belfast is among 10 grounds in the UK and Republic of Ireland's joint bid to host the Euro 2028 championship.
Work has not yet started on the 34,500-capacity stadium, which has suffered years of setbacks including legal challenges.
The stadium originally had a budget of around £77million, with Stormont pledging £62million and the GAA providing £15million.
Ulster GAA has previously insisted it does not intend to increase its contribution, while the ongoing absence of a Stormont Executive also placed additional funding in doubt.
But with the GAA and UK government expressing confidence the stadium will be built on time, there is speculation the British and Irish governments could be willing to step in to bridge the funding gap.
Ulster GAA's Stephen McGeehan told the BBC: "We're absolutely delighted that we now see a pathway and a way forward to work with officials to get the necessary approvals, either with an Executive or with the support of the UK and Irish governments, to ensure that Casement Park can and must now happen."
UK Culture Secretary Lucy Frazer also said she was "very confident" that Casement Park would be delivered on time.
An estimated cost of around £112million for the stadium was outlined in Ulster GAA's draft full business case in November 2019.
It has since provided "draft information" on an updated cost which is "close to being finalised" but is "not yet complete", the Department for Communities said in a Freedom of Information response.
It added that "technical and commercial considerations are ongoing, and rigorous and candid assessment and evaluation is being undertaken".
The department last year said another estimate would "need to take into account potential increased cost estimates due to delays to the planning approval, construction inflation, repeated design stages and the delay as a result of the judicial review".
In 2021, then DUP First Minister Paul Givan said the cost of the proposed new stadium could be more than £140million.
In a statement an Ulster GAA spokesman said: "Our timeline for completion of the technical design is on track and we look forward to working with all partners to deliver upon the commitments given by successive Northern Ireland Executives and treasuries for Ulster GAA's new provincial stadium.
"Collaborative scenario planning currently sees work commence on site in 2024 and when construction commences it is envisaged that the project will take up to two years to complete."
Civil servants have been left running the Executive's nine departments in the continuing absence of a power-sharing government.
Since last year the DUP has been blocking the restoration of the devolved institutions in protest against Brexit's Northern Ireland Protocol.
Secretary of State Chris Heaton-Harris is due to set a Northern Ireland budget in the absence of local ministers, with some departments potentially facing cuts as large as 10%.
Sinn Féin MLA Deirdre Hargey, former Communities Minister, described the Euro 2028 bid as an "exciting opportunity".
She said: "The potential to host multiple major fixtures at football stadiums across Ireland and Britain, including a newly built Casement Park, is a huge boost for local sport.
"Work to build the new Casement Park must begin urgently to ensure this first-class venue is ready for the potential of Euro 2028 fixtures being played there."
SDLP MLA Justin McNulty, the party's sports spokesperson, welcomed Casement Park's inclusion in the Euro 2028 bid.
He said he hoped it would "refocus minds and spur on efforts to begin work at Casement".
Belfast City Council is setting aside £4million towards the cost of potentially being involved in hosting Euro 2028.
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