Goal chief executive Barry Andrews has confirmed he is stepping down from his position at the aid agency and that a successor will start next month. 

Mr Andrews said he made the decision following "a tough few months" for the charity, after the US Office of the Inspector General launched an inquiry into alleged supply chain irregularities relating to US-sponsored aid programmes in Syria.

Speaking on RTÉ’s Morning Ireland, Mr Andrews said he strongly feels everyone is replaceable and they have to take responsibility when things go wrong.

"We grew very quickly as an organisation and I think it is fair to say during that growth period where we were responding to the Ebola crisis in Sierra Leone, natural disasters, and to the Syria crisis where some of our internal controls did not develop and evolve at the same speed, and I have to take responsibility for that," he said. 

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He said Goal had commissioned "a forensic investigation of those systems and it led to the termination of staff in Turkey. It led to some staff changes in Dublin. We've taken it as absolutely seriously as we can".

He added: "We have an action plan in place now to demonstrate whereby we are committed to providing an assurance framework to our donors and our supporters to demonstrate how seriously we are taking it and, my stepping down, is part of that, in my opinion."

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The Department of Foreign Affairs has also withheld €10.1m funding from Goal as the investigation into procurement practices continues.

In a statement, Minister for Foreign Affairs Charlie Flanagan said he would like to acknowledge Mr Andrews "personal contribution" to the role but added that he has been "seriously concerned" by the issues under investigation.

Mr Andrews, a former Fianna Fáil minister of state, was appointed to the role in 2012 shortly after former CEO John O'Shea announced he would retire from the post he held since he founded the organisation in 1977.

Chairperson of Goal Anne O'Leary said Mr Andrews was "largely responsible for helping stabilise the organisation following his appointment".

"The number of people Goal have been able to reach has increased in his time from approximately four million people across 13 countries at the end of 2012, to 12 million people across 19 countries by the end of 2015."