On Friday, the UK government announced it would not fund the redevelopment of the west Belfast stadium in time for the Euro 2028 football tournament.
Casement Park was due to host five matches at Euro 2028.
Northern Ireland could still have a role as a training base or host warm-up matches at Belfast's existing Windsor Park stadium.
Thank for joining us for our live coverage on reaction to the UK government's announcement that it will not fund the redevelopment of Casement Park in time for the Euro 2028 football tournament.
This concludes our live coverage for today, but there is more on this story here.
This page was edited by Rebekah Logan with additional reporting by Gloria Ifonlaja, Judith Cummings, Faye Kidd and Barry O'Connor.
Image source, GAA2011 - £61m is pledged by the Stormont executive towards a new 38,000-capacity stadium at Casement Park.
2012 - Designers are appointed to the project, and it is expected the new stadium would be built by 2015.
2013 - The last GAA game is played at Casement Park, and planning permission is granted in December for a 38,000 capacity stadium.
2014 - The High Court overturns planning permission for the project due to safety concerns over how long it would take people to leave the ground in an emergency.
2015 - The GAA revise the capacity from 38,000 to about 34,500.
2017 - The organisation submits a fresh application for planning permission.
2020 - Infrastructure Minister Nichola Mallon backs planning approval.
2021 - Planning permission is granted. The build is expected to start in 2023 and take two years.
2022 - A local residents' group loses a legal challenge against plans, meaning the stadium could go ahead.
2023 - Casement Park was confirmed as a venue for the Euros 2028.
2024 - Clearing begins on the site in February.
Image source, PASDLP MLA Matthew O'Toole says he cannot understand why the issue of Casement Park wasn't raised in a meeting with the chancellor last week.
O'Toole says it's "surprising" the topic wasn't discussed "during such a high-level meeting".
Finance Minister Caoimhe Archibald confirmed Casement Park was not raised by her or the first and deputy first ministers, who were also at the meeting, but says it has been raised "on many, many occasions with the chancellor".
Hilary Benn has defended the government's decision to issue the Casement Park announcement late on Friday evening.
"We wanted to inform everyone together and as quickly as possible as every single one of us is going to have to take stock," he said.
"Clearly there needs to be a new design than what was envisaged for the Euros."
He said: "The last government did absolutely nothing to progress the project at all, we looked to see if it might be possible to rescue it but in the end, the conclusion we came to was even if you put a very large amount of money into it, there was a risk you would not complete the stadium in time for the Euros.
He added that he had spoken to the First Minister Michelle O'Neill and would talk to the GAA President Jarlath Burns later on Monday.
You can watch the interview in full on BBC Newsline at 18:30 BST.
The Northern Ireland Secretary has declined to say how much money the government might be willing to contribute to redeveloping Casement Park.
Hilary Benn says all parties, including the Stormont Executive and the GAA, now need to "take stock".
He added that changed circumstances of the stadium's proposed facilities meant "now is not the time to pledge a sum".
He previously said that the government was committed to ensuring the stadium was built.
Jayne McCormack
BBC News NI political correspondent
Image source, ReutersFirst Minister Michelle O'Neill has described the UK Government's handling of the decision not to fund Casement Park for Euro 2028 as "absolutely shambolic".
O'Neill said it was an attempt to "bury bad news" and "hope people wouldn't notice" after it was released via email at 19:10 on Friday night.
She added that the government now needs to spell out its "plan B" regarding a contribution towards the stadium.
Deputy First Minister Emma Little-Pengelly said questions needed to be asked of the Irish Football Association as well and what role Northern Ireland could still have in the football tournament.
"The leadership of the IFA now needs to outline what their plan B is and how they can ensure the football community and Northern Ireland can have a legacy in what is happening elsewhere."
Finance Minister Caoimhe Archibald says Casement Park was raised with the chancellor on many occasions and the response was that a decision was imminent.
She says "dither and delay" from the previous government "effectively ran down the clock" on Casement Park and "left us in the position we are now in".
She confirms to the leader of the opposition that at no point were officials in her department made aware that an announcement was being made on Friday evening.
Speaking on BBC Radio Ulster's Talkback programme, former SDLP special advisor Brendan Mulgrew has said: "I don't see any other viable way in which Northern Ireland can host games."
Other methods for Northern Ireland to be included in the Euros will not give fans "the same experience" as fans in the rest of the UK and Republic of Ireland, he added.
You can listen back to the programme by clicking the watch and listen tab at the top of this page.
Responding to a question on when he found out about the government's decision on Casement Park, the communities minister says his private office was emailed at 18:32 BST on Friday evening.
Gordon Lyons says this was then forwarded to departmental email at 19:00.
The SDLP's Mark H. Durkan responded by asking was it not "odd" that the minister found out 48 hours after the finance minister was told of the government's decision to pause funding for city deals?
Lyons said: "I think that it is inappropriate what has taken place with the government over the last week in terms of announcements.
"I think that it is right and proper that the minister can answer questions on this."
Communities Minister Gordon Lyons is answering questions in the Assembly on Casement Park.
You can watch the proceedings by clicking play at the top of this page.
Enda McClafferty
BBC News NI political editor
Image source, PA MediaTaoiseach Simon Harris has refused to “rule in or out” providing extra money for the redevelopment of Casement Park.
He says the €50m already pledged by the Irish Government will remain in place "regardless of the decision around Euro 2028".
Speaking on a visit to Derry he said the redevelopment of Casement Park “has to happen” and his government stands by to “assist in any practical way they can”.
Mr Harris say he understands the disappointment but that he knows the British government "wouldn't have arrived lightly" at the decision.
“What I have heard from people in recent days is, Casement is still going to happen, it has to happen," says Mr Harris.
“All stakeholders now need to intensively engage to work out how best to proceed.”
But he praised the new relationship between London and Dublin which he says will not suffer because on “one individual decision”.
He also said it was important Northern Ireland benefited from Euro 2028 even without hosting some of the games.
Traditional Unionist Voice (TUV) assembly member Timothy Gaston welcomed the government's decision to "finally call time on the fairy tale that is building Casement in time for the Euros".
He said the project in west Belfast had "lost the run of itself".
"This is a project that was ill-conceived from day one with huge opposition from local residents, which resulted in years of delay," he said.
Gaston said the estimated cost "dwarfed" spending on other sports and would have led to a "festering within the unionist community".
"It would have been madness to commit £400m to fund the cash cow of the GAA," he told assembly members.
Justin McNulty of the Social Democratic and Labour Party (SDLP), the formal opposition in the Stormont assembly, said the handling of Casement Park has been a "failure of government at virtually every level".
The assembly member, who played for Armagh and manages the Laois county team, said "trust is in tatters" between GAA members and the Northern Ireland Executive.
"The collapse of government on two occasions for more than five years in that time has had a catastrophic impact on delivering this showcase project," he added.
Stephen Kelly, the chief executive of Manufacturing NI, said a £400m price tag was high but that "stadiums are big and expensive things".
"We’re really good at actually manufacturing them here in Northern Ireland and putting them into locations in the UK," he tells Talkback.
"The challenges that we have in this part of the world in terms of planning – it is tortuously long and as a result it adds significantly to the costs.
"Delay adds additional costs as prices inflate, as wages inflate.”
Former Northern Ireland international footballer Gerry Armstrong tells the Talkback programme that the cost of building Casement Park is "just ridiculous; it's way too much money, and we just can't afford that".
He says he isn't hopeful about Northern Ireland having a role in the Euro 2028 tournament because "there are so many parts of the jigsaw that are not ready and cannot be ready".
"As far as I can see, there is no way forward now," he added.
You can listen to Talkback by clicking play at the top of this page.
Image source, PA Media
Lord Elliott says Casement should be redeveloped, but there is "no endless pot of money".
He added that "we have to be realistic about how we are taking this forward".
The assembly member also questioned, "why did we not try to improve Windsor Park" in time for the Euros?
Alliance Party assembly member David Honeyford said Casement Park being ruled out of the Euros is a "massively missed opportunity".
He said the stadium being included in the tournament was a chance to "break down divisions" and "bring the community together".
He told the assembly that "for the economy, it's an embarrassment on the world stage," and the government making the announcement on a Friday evening was "disgraceful".
Taoiseach Simon Harris was asked about Casement Park when he spoke to reporters in Londonderry a short time ago.
He says Belfast needs a GAA stadium.
Image source, PA Media"I've been quick out of the trap to firmly state that the Irish government commitment of €50m stands for this project," he said.
"What we need to see is what the British government and the Northern Ireland Executive want to do next."
The Leader of the Opposition, SDLP MLA Matthew O'Toole, says the failure to build Casement Park on time for the tournament is a "vast and indefensible failure of the people of West Belfast, everyone in this city and region, and the entire island of Ireland".
He called it a "profound and multi-layered failure", highlighting the government's "failure to deliver on promises made" and "years of contradictory statements" from the executive.
Former SDLP special advisor Brendan Mulgrew told the Talkback programme that years of delays, planning issues, a legal challenge, and the rising cost of building materials meant the project had to be completely "reshaped and redesigned".
"As all of that was rolling out, the costs were going up, the cost of materials were going up, and we had all sorts of factors forcing the costs up—none of which were the direct fault of the GAA," he said.
He added that all stakeholders "have a role to play" in "A. Finally, bottom out the price; what price are we looking at here; and then B, fill the funding gap—match the funding gap.”
You can listen to Talkback by clicking play at the top of this page.
