Italian newspaper Corriere della Sera has speculated in recent days that Vatican investigators were looking into whether Pell's nemesis at the Vatican, ousted Cardinal Angelo Becciu, wired 700,000 euros ($A1.1 million) in Vatican money to a bank account in Australia, and whether that money was tied to Pell's sex abuse trial.

Pell, brought in by Pope Francis to bring accountability and transparency to the Vatican's opaque finances, was convicted but ultimately absolved by Australia's High Court of allegations he molested two choirboys in St. Patrick's Cathedral in Melbourne while he was archbishop in the 1990s.

Corriere speculated that Becciu might have "bought" the testimony of Pell's accuser to get Pell out of the Vatican. Becciu and Pell were known to have clashed over the Australian's financial clean-up efforts at the Holy See.

The Corriere report had no sourcing, attribution or details and the report appeared more an effort to discredit Becciu and distract attention from the shortcomings of the Vatican prosecutors' primary investigation into a London real estate venture.

Becciu has strongly denied the allegations.

"In relation to what has been published by some organs of information, I categorically deny any interference in the trial of Cardinal Pell," Becciu said in a statement released by his lawyer, Fabio Viglione.

Vivian Waller, a lawyer for the prosecution's key witness whose testimony led a jury to initially convict Pell in 2018, said Monday her client hadn't been bribed.

"My client denies any knowledge or receipt of any payments," Waller said in a statement. "He won't be commenting further in response to these allegations."

Pell was forced to take a leave of absence from his job as Pope Francis' economy minister in 2017 to return to Australia to face the charges and ultimately stand trial.

After Australia's High Court absolved him in April, Pell returned to Rome last week to clean out his Vatican apartment, but has said he intends to make his home in Sydney.

Australian prosecutors' star accuser, known in court as "Witness J," first went to police with allegations against Pell on June 18, 2015 - only 18 months after Francis appointed the cardinal as Prefect of the Secretariat for the Economy and well before his friction with Becciu reached crisis point.

Victoria Police were under pressure at the time to the bring church pedophiles to justice after a state inquiry and then a federal inquiry into institutional abuses of children exposed the extent to which clerics had perpetrated and enabled the molestation of children over decades.

Pell's lawyers argued Victoria Police set up a "Get Pell" operation at least a year before any complaint was received about him. His supporters say he ultimately became the fall guy for all the failings of the Australian Catholic Church, but never sexually abused anyone.

The Victoria Police media unit said on Monday it couldn't find any record that the Vatican had alleged witnesses against Pell were bribed with Vatican money.

Australian Associated Press