Sport Ireland's forensic audit of the FAI's finances is to be delayed following the resignation of former FAI CEO John Delaney on Saturday.
The State body had appointed Northern Irish firm KOSI Corporation Ltd to conduct a full and extensive look at the FAI's accounts and to assess the association's "fitness to handle public funds".
The auditors were due to present their findings to Sport Ireland next Monday 7 October.
Sport Ireland is currently withholding State funds from the FAI.
However, the auditors are now seeking additional time to complete their work "in light of the developments of recent days" and so that they can "seek and review extra material from the FAI".
In a letter to the Oireachtas Committee on Transport, Tourism and Sport this afternoon, the Chief Executive of Sport Ireland John Treacy, confirmed his body had granted the auditors request for more time.
"KOSI Corporation was scheduled to submit a draft report to Sport Ireland next week. In light of developments in recent days, KOSI have requested additional time to seek and review extra material from the FAI. Given the vital importance of this matter, this request for additional time has been granted by Sport Ireland', Mr Treacy stated.
No new date for the completion for the audit is mentioned in the letter.
Sport Ireland is due to appear before the Oireachtas Committee on Transport, Tourism and Sport on 16 October to discuss governance and funding at the FAI.
However, Mr Treacy said this hearing could be "premature" should the audit not be concluded.
"We respectfully request that the committee considers deferring ... until the process had concludes," he wrote.
Mr Treacy also confirmed that a draft report from KOSI will be forwarded to both the board Sport Ireland and the FAI for review and consideration before a final report is presented to Minister for Transport, Tourism and Sport Shane Ross.
"These necessary steps will take some time," Mr Treacy warned.
The KOSI/Sport Ireland review is one of three ongoing investigations into the FAI's affairs, with the Office of the Director of Corporate Enforcement and the FAI's own review by the accountants Mazars also ongoing.
The Chairperson of the Oireachtas Sports Committee Fergus O'Dowd, as well as the co-leader of the Social Democrats Catherine Murphy, Sinn Féin spokesperson on sport Jonathan O'Brien, and his Fianna Fáil counterpart Marc MacSharry, have led the political calls for the FAI to reveal the full details of Mr Delaney's exit package as a matter of urgency.
Reporting by Barry Lenihan