MPs have heard that News International was told in 2008 that there were three more journalists, in addition to royal editor Clive Goodman, involved in phone hacking.
Julian Pike, a lawyer who advised the company, was giving evidence to the Culture, Media and Sport Committee on 19 October 2011.
He said he had "not done very much" to dispute the firm's claims that only "one rogue reporter" was involved, but he insisted he was "not party to any cover-up".
Mr Pike works for solicitors Farrer & Co, who advised News International in their case with the Football Association's Gordon Taylor who was given a reported £700,000 to settle a NoW phone-hacking claim.
Committee chairman John Whittingdale said in September he wanted to hear from Mr Pike before recalling News Corp boss James Murdoch to give further evidence.
The committee also heard from Mark Lewis, the solicitor who represents many of the alleged victims of phone hacking - including the family of Milly Dowler and who represented Mr Taylor.
Mr Lewis said the settlement for Gordon Taylor was much higher than would have been expected in a privacy case in which no story was actually published.
He told MPs he believed that was to "hush up" the matter and encourage him not to bring any further claims or make public any further allegations.
The scandal stretches back to 2006, when police arrested News of the World royal editor Clive Goodman for illegal phone hacking.