Cardinal George Pell says he doesn't know if he'll ever return to Australia amid claims he's being investigated by Victoria Police for alleged sexual abuse.

Speaking publicly for the first time since the bombshell report in the Herald Sun, Cardinal Pell reportedly said he doesn't know if he'll ever come back to Australia, where he is reportedly under investigation by Victoria Police for alleged sexual abuse of up to 10 boys across four decades.

Having issued a lengthy statement on Friday strongly denying the allegations, the 74-year-old said he has said enough already and has co-operated.

Senior police are yet to decide whether there is enough evidence to justify seeking an interview.

Cardinal Pell, the third most powerful Catholic leader in the world, will give evidence to the Royal Commission via video link in the Sydney hearing next Monday but its not known if the latest revelations will be raised.