British Cycling chief executive Ian Drake is under growing pressure to reveal what he knew about the allegations which have left his organisation in crisis as the Rio Olympic and Paralympic Games approach.
Shane Sutton resigned as technical director on Wednesday, while refuting claims of discrimination which will be investigated in an independent review.
Two separate sources have told Press Association Sport that Drake was aware of claims of bullying and discrimination against Sutton and did not act.
An internal performance review conducted after the London 2012 Games saw more than 40 riders and staff interviewed.
But the post-London 2012 report, written by Peter King, Drake's predecessor as the organisation's chief executive until 2008, was not published or made available to senior personnel. It remains confidential.
British Cycling said the report would be made available in the independent review process.
A statement from the governing body read: "British Cycling conducted a comprehensive structural review after London 2012 to look at how we could build on that success.
"The report will now be made available to the independent review led by UK Sport.
"Until the review is concluded, we cannot comment any further."
Britain won eight gold medals at the 2008 Olympics and 2012 Games - claiming seven out of 10 events on the track at each Games - when Sir Dave Brailsford was performance director and Sutton his right-hand man as head coach. Britain won 25 more golds in the 2008 and 2012 Paralympics.
Sutton was named technical director of British Cycling, succeeding Brailsford, in April 2014.
But it has emerged Sutton did not declare that he was still an employee of Team Sky, the British road team run by Brailsford and with close links to British Cycling, when he took on the role.
Drake, in a BBC interview on Wednesday evening, answered "no" when asked if Sutton was still employed by Team Sky.
Sutton, who was unavailable for comment on Thursday, left his role as Team Sky head coach in January 2013, but is still employed in an advisory role.
The role could be perceived as nepotism as Brailsford and Sutton have enjoyed a long and successful working relationship and are good friends.
However, British Cycling had no concerns over Sutton's work for them and Team Sky employs numerous British riders who also compete for Great Britain.
Team Sky on Thursday said Sutton's position has not been a secret - but they would not disclose his remuneration and further details of his employment.
"Shane has continued to be used by Team Sky in an occasional advisory role," a statement from Team Sky read.
"Since he stepped down as head coach of Team Sky in January 2013 his occasional involvement as an advisor to Team Sky has been completely separate from his role with British Cycling.
"Any reimbursement for his work with Team Sky has been funded by the team."
The relationship between Team Sky and British Cycling was subject of a review by auditors Deloitte, published in March 2011, which identified "no major risks".
Sutton was suspended by British Cycling on Tuesday after it was claimed he called Paralympic cyclists "gimps", shortly after announcing an independent review into claims of sexism made by Jess Varnish. He quit less than 24 hours later.
Meanwhile, British Cycling has denied high-performance equipment provided by UK Sport has been sold on for profit.
UK Sport, the funding body which distributes lottery cash to Olympic and Paralympic sports, instructed British Cycling to carry out an investigation after it was alleged skinsuits and bikes, worth in the region of £10,000 each, had been made available to the highest bidder.
A British Cycling statement read: "British Cycling keeps a detailed and exhaustive inventory of all UK Sport-funded equipment - going back over 10 years - and can categorically state that no kit or equipment provided by UK Sport is, or has ever been, given away or sold on for profit, or has even left the National Cycling Centre, in Manchester."
There was further bad news for British Cycling when Simon Yates tested positive for asthma medication, following an administrative error which meant he did not have the required therapeutic user exemption certificate.
His Orica-GreenEdge team accepted responsibility, and said: "There has been no wrong-doing on Simon Yates' part."
Source: PA-WIRE
