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Former BBC China editor, Carrie Gracie, who resigned from his position in protest against inequality of wages, will give evidence to Mps on a select committee later.
Director-general Tony Hall will also speak to the House of Commons, Digital, Culture, Media and Sport Committee.
A study published on Tuesday said there was “no evidence of sexism in the salary decision-making” at the BBC.
But the study, conducted by statutory auditors, PwC, has been rejected by the BBC Women, a group that represents 170 of the female staff.
The group, which includes the presenters and producers, said: “there is no transparency on which individuals were included or why.
“The BBC has chosen who to compare with who, and what are the factors to justify the difference in salary. The only mention of equal pay in the engagement letter with PwC refers to an assessment of equal pay risk.”
It is understood that the BBC will now consult with staff on the report’s recommendations before deciding which to adopt.
The issue has been at the heart of the news since last summer, when the BBC has published a list of speakers who earn more than £150,000 per year, which reveals a gap in the results of its better known men and women presenters and actors.
Gracie has resigned from China, the editor at the beginning of January, she said she has been dismayed to discover the BBC, two men international publishers earned “at least 50% more” than their two counterparts of the female sex.
On Tuesday, Lord Hall, has apologised to any employee of the BBC, which had not been paid correctly, but he said that he believed that the BBC had not violated the equal pay law.
Lord Hall told Channel 4 News: “I do not believe that there has been illegality of the BBC to the point where someone said,” You are a woman, therefore, you are going to be paid less.'”
Following the PwC review of the BBC’s director of news Fran Unsworth said that some presenters had high wages as a “legacy” of previous compensation arrangements.
Speaking of Newsnight, she said: “there may be good reasons why two people of the same job are on different salaries, and those criteria are around how long the person has been doing that, it the profile is with the public, the public will adjust it in the program because of this person?
“In this case, it is not an equal pay claim under the law.”
Newsnight presenter Evan Davis asked why more had not been done to remedy the inequities before the publication of the presenters, salaries, last summer.
“I was going to accept the premise of your question that we should have been on this sooner,” He replied.
Maria Miller MP, chair of the Women And Equalities select Committee, said that he was still “a lack of independent review” at the BBC.
“They just aren’t giving me confidence,” she said. “If they can find no evidence that there was a link for pay discrimination because of sex, maybe they are just not looking hard enough?”
Last week, six high-profile men at the BBC, including John Humphrys, Jeremy Vine and Nicky Campbell, said they would take pay cuts to help close the pay gap.
Lord Hall, who earns £450,000 a year as the director-general, said that he had not taken a pay cut himself.
“I had exactly the same salary since I’m here, I’m not looking for more, I’m not looking for less,” he told Channel 4 News.
“I’m very well paid and I’ll leave it at that. I think that I am paid for what I do and I’ll stay there.”
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