Two members of the Oireachtas banking inquiry are understood to have concerns about the committee's draft report and may not sign off on it.
The committee is still meeting tonight working on its findings and recommendations.
However, the backing of Sinn Féin's Pearse Doherty and Socialist Party Joe Higgins is in doubt.
It is also looking increasingly likely that the inquiry will meet again tomorrow as the executive summary has yet to be discussed.
This morning, members agreed the contents of the section on the role of State institutions.
The inquiry has discussed the amendments to all 11 chapters of its draft report and is now working on the findings and recommendations.
While progress has been made on some contents, no section of the report has yet been signed off by the members.
Speaking during a break of the committee, inquiry Chairman Ciarán Lynch said their work was always going to be challenging as it was made up of a group of cross-party members.
However, he said they had operated by consensus rather than the typical adversarial politics of the Dáil.
Fianna Fáil's Michael McGrath said they were making good progress although it was slow. He said it was quite a lot of work and was detailed and painstaking but he was hopeful of consensus.
He said it was possible it would go in to tomorrow as a huge amount of work remained in tidying up and formatting the amendments agreed.
He said there was no buffer or wriggle room in order to meet the 27 January date, one day ahead of the existing absolute deadline.
Earlier today, the inquiry worked through the section on the roles played by State institutions, including the Central Bank and the Financial Regulator.
An earlier version of the report was dismissed by some as too political.
A majority of members is needed to get the draft over the line before it goes out for legal review and third-party consultation.
