Former tabloid editor Piers Morgan is to appear before the Leveson Inquiry via videolink from the United States.
Mr Morgan, the former Daily Mirror and News of the World editor, now a CNN interviewer, is expected to be asked about comments he has made on phone hacking when he gives evidence.
He stressed in a statement in August: "I have never hacked a phone, told anyone to hack a phone, nor to my knowledge published any story obtained from the hacking of a phone."
The other witnesses on Tuesday include Sharon Marshall, former TV editor of the News of the World and now resident soap expert on ITV1's This Morning.
Solicitor Julian Pike, of Farrer and Co, has been recalled to provide details of when News International learned that actress Sienna Miller was bringing an action against the company over the hacking of her phone.
The inquiry will also hear from Matthew Bell, co-owner of Ferrari Press Agency, Chris Johnson, who runs Liverpool-based Mercury Press, and Steve Turner, general secretary of the British Association of Journalists.
Prime Minister David Cameron set up the Leveson Inquiry in July in response to revelations that the News of the World commissioned a private detective to hack murdered schoolgirl Milly Dowler's phone after she disappeared in 2002.
The first part of the inquiry, sitting at the Royal Courts of Justice in London, is looking at the culture, practices and ethics of the press in general and is due to produce a report by next September.
The second part, examining the extent of unlawful activities by journalists, will not begin until detectives have completed their investigation into alleged phone hacking and corrupt payments to police, and any prosecutions have been concluded.