Ulster GAA have been working intensely on the project to keep hopes alive of the stadium being redeveloped in time to host Euro 2028 matches with the target of main construction beginning in January.
It is understood the redevelopment will involve a 30-month construction period.
Political discussions between the British and Irish governments were held on the cost and funding of the project last weekend.
Euro 2028 is a joint British and Irish-backed tournament and Casement Park was chosen as one of the venues to host matches alongside stadia in England, Scotland, Wales and the Republic of Ireland.
The ground has been closed since 2013, but Ulster GAA secured substantial funding from the Irish Government, and it is also understood there is an openness to increase that funding.
Last weekend Keir Starmer met Taoiseach Simon Harris at Farmleigh House in Dublin - the first official visit of a British Premier Minister here since 2019.
With the Irish Government keen to reset Anglo/Irish relations in the post-Brexit era, there were hopes that an announcement on the final funding of the project may have come at that point.
Instead, the wait continues with the 16 September cut-off point approaching.
Originally, the project was estimated to cost around £80m, but now estimated costs could lie at just over £300m.
Thus far, the NI Executive has pledged £62.5m, the Irish Government £43m, and the GAA have committed £15m.
GAA Central Council delegates were also informed at the weekend that the association has seen expenditure in the region of £10m on the project to-date. It is hoped that news of the funding to be provided by the British government will be revealed in the coming days.
A Grant Thornton report has already found that hosting Euro 2028 at Casement will provide a huge boost for the economy in the north, estimated to be £106m at least.
Informed by data and analysis from a range of sources including Tourism NI, the NI Hotel Federation and the Irish FA, the report set out expected accommodation spend of £52 million and other local expenditure of £54 million in bars, restaurants and other retail outlets, prompted by the five games in June 2028.
While the economic impact of all 51 games across the UK and Ireland has been calculated at £2.6 billion, which equates to a pro-rata contribution of £255 million for Northern Ireland, the Grant Thornton report takes a more considered and prudent view of hosting games in Belfast.
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