Oxfam said on Thursday it hired another man to work in Ethiopia a few months after he had been dismissed for misconduct in Haiti.
Oxfam are now looking at whether any issues about his conduct were raised in the African country and say it highlights the need for a "sector-wide approach to the vetting and recruitment".
The spokeswoman said the decision was a "serious error and should never have happened".
Three others, including the country director Roland van Hauwermeiren, resigned before the end of an internal investigation in 2011.
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"The allegations appear very serious and we don't rule out the possibility to revoke Oxfam's authorization to operate in Haiti as an NGO, should alleged misconduct prove to be true", he said by phone, late on Tuesday. "I shall react... Many people, including in the global media, will blush hearing my version of facts", van Hauwermeiren was quoted as saying by the Het Nieuwsblad newspaper.
"It is not that I deny everything", he told the paper.
Actress Minnie Driver quit and slammed the charity's "abhorrent mistakes" and added: "I am nothing short of horrified by the allegations against Oxfam International". There are things that are described correctly. But there are many lies and exaggerations.
"Parties every week? Chic villas? Women paid with money from the organisation?"
A subsequent country director for Haiti, Damien Berrendorf, was sacked past year but had no connection to the previous case.
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It comes as International Development Secretary Penny Mordaunt was due to meet director-general of the National Crime Agency (NCA) to discuss how they could jointly tackle sexual exploitation and abuse.
The NCA has been "closely monitoring" allegations and confirmed it has a range of powers to investigate sexual offences committed outside the United Kingdom and support foreign security forces.
The British charity has come under sharp criticism for its handling of allegations that staff members hired prostitutes in Haiti following the devastating 2010 quake.
In a four-page open letter to a broadcaster in his native Belgium, he said an unnamed former employee was the source of reports that first broke in The Times. The aid industry is a magnet for good people to try and do good work.
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She also expressed concern for the future of the country, telling another contestant, "No, it's not going to be OK". Ross then asked Marissa if she thinks Omarosa is "coming back", and she whispered, "I don't think so".