Former president, Ballina native, Mary Robinson is leading a panel to investigate the leader of the African Development Bank (AfDB), accused by whistleblowers of corruption.
Akinwumi Adesina, became the first Nigerian to lead the AfDB in 2015 - but a report earlier this year claimed that under his watch the bank had been tarred by poor governance, impunity, personal enrichment and favouritism.
He was cleared by the organisation's ethics committee, but international pressure has mounted with the United States calling in May for an independent investigation.
Mrs Robinson will lead the probe, alongside Gambia's Chief Justice and the World Bank's integrity vice president.
The governors of the AfDB, one of the world's five largest multilateral development lenders, expressed "their complete confidence" in the panel.
The inquiry is due to deliver its findings in two to four weeks.