Updated: 9.30pm
John Delaney has stepped down as vice-president of the Olympic Council of Ireland with immediate effect.
The FAI chief executive informed acting president Willie O'Brien by email that he will be relinquishing his role.
He will no longer have any involvement in the OCI, a spokesperson for the organisation confirmed.
In a statement, Mr Delaney said he reached the decision following "careful consideration".
His work as CEO of the FAI is his primary role and priority, he said.
"I have always been 100% committed to fulfilling my role, my obligations and duties in ensuring the growth and development of football in Ireland, which I will continue to do."
Mr Delaney added: "As an executive committee member of the OCI, my role was never active in the day-to-day running of the OCI and as I mentioned previously, I was in a position to attend only five of the last 13 board meetings prior to the Rio Olympics.
"I had no role or involvement in the OCI's handling of ticketing arrangements for the RIO Olympic Games.
"During my time as a member of the OCI executive committee, I have always looked to the best interests of the Olympic movement, and in recent months I have worked extensively with the other OCI committee members to ensure that all proper steps have been taken by the OCI, following the issues that arose in Rio.
"As part of this, I have fully engaged and co-operated with investigations being carried out by Grant Thornton who were appointed to review ticketing arrangements and Deloitte, whose brief is to examine governance issues within the OCI.
"I will, of course, also provide all assistance sought by Mr. Justice Carroll Moran as part of the government-appointed inquiry.
"I am fully confident that in due course my position and non-involvement in these matters will be clarified and independently verified on completion of reports carried out by Grant Thornton or Justice Carroll Moran.
"I wish the OCI executive and the Olympic movement, in this country, all the best into the future and I will always follow with interest their sporting achievements."
Acting president Willie O'Brien said: "This evening I accepted with regret the resignation of Mr John Delaney from his position as vice-president of the Olympic Council of Ireland.
"I would like to thank John for his hard work and dedication to the Irish Olympic movement in his time as a member of the executive committee and I wish him well for the future.”
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