Oxfam International executive director Winnie Byanyima said earlier that she is appointing an independent commission to investigate the allegations that staff members used prostitutes in Haiti after the country's 2010 quake, and also in Chad.
British charity Oxfam has called on all those who have been victims of abuse by its officials to come forward.
Earlier this week at the NME Awards, Eavis' father, Michael, told the Press Association: "We've raised millions through the years with Oxfam - six million quid and everyone's said what a wonderful charity they are and we still support them". My message to women who have suffered: I'm fighting this abuse.
He is said to have told her: "I find you very sexy, how can I help you?"
She said Friday that the commission will "look into our culture and our practices" and set up a vetting system for staff.
The charity has come under fire this week over the suspected cover up and failure to act on allegations that members of staff used prostitutes and aid works for sex.
Oxfam sacked four workers and let three others resign over the scandal but the government and charity regulators have criticised Oxfam for a lack of transparency.
"Oxfam has agreed to withdraw from bidding for any new UK Government funding until (the Department for International Development) is satisfied that they can meet the high standards we expect of our partners", Mordaunt said in a statement on Friday.
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The charity has also lost a number of celebrity ambassadors including Good Will Hunting actress Minnie Driver, and Nobel Peace Prize victor Archbishop Desmond Tutu.
Indeed had their atrocious behaviour not been exposed in the Press, we may never have known and happily continued donating our money to assist in the propagation of this revolting behaviour.
The announcement follows days of controversy surrounding the charity group involving accusations against staff who were stationed in Haiti following its disastrous 2010 natural disaster. "And I did not give her any money", he said, adding that he was however "deeply ashamed" of the liaison.
"This was with an honourable, mature woman, who was not an quake victim nor a prostitute".
"I went into my room and was starting to undress and go to sleep and he just walked in, shoved me on the bed and tried to rip my clothes - I mean he did rip some of my clothes off", she said.
Oxfam CEO Mark Goldring said the organization is working to protect staff, volunteers and communities around the world.
The charity has denied covering up the Haiti affair, which has prompted a drop in donations and led the British government to threaten to cut funds to organisations which try to hide sex scandals.
"I know the man next door to me heard because the next morning he said something like, "Hey are you all right after what happened last night"?"