Michael Lynn's solicitor has been instructed to file an immediate appeal against his conviction and sentence.
The 55-year-old former solicitor was jailed for 5.5 years yesterday for stealing millions of euro from various financial institutions.
He stole a total of €18 million from six financial institutions during the Celtic Tiger era by taking out multiple mortgages on the same properties, including his own €5.5 million home in Howth, Co Dublin.
It took years to bring Lynn to justice because he fought his extradition from Brazil.
His solicitor Ciarán Mulholland told Newstalk Breakfast his client also wants to see a tribunal into banking in Ireland.
"As things stand an appeal is being prepared and being filed in respect to that conviction," he said.
"But also in addition to that, the gravity of the sentence handed down at the court yesterday afternoon.
"I wouldn't be at liberty to get into the specifics of the appeal at present, suffice to say that Michael Lynn does not accept the counts of guilt that have been returned by the jury".
'Cavalier manner'
Mr Mulholland said an Oireachtas tribunal into banking needs to look deeper into Celtic Tiger practices.
"I think everybody, irrespective of what their views are or what society or public opinion's views on having an entitlement and expressing that entitlement, if anybody was following the initial trial or the retrial one would have a hell of a lot more questions than answers," he said.
"It hasn't brought any form of conclusion to the proceedings or what was going on at the time.
"What was proven during the course of the proceedings was is what we all know - that it was reckless banking in and around that period of the Celtic Tiger years.
"There was a cavalier manner in which the banks conducted themselves".
Michael Lynn arriving at the Criminal Courts of Justice in Dublin, 1-11-23. Image: Leah Farrell / © RollingNews.ieMr Mulholland said the 2016 Banking Inquiry did not go far enough and needs to look further "into the culture of the lending practices, how unregulated those lending practices were".
"A lot of people listening to this show this morning are struggling on the property ladder - either can't get a mortgage or can get nowhere near even dreaming of getting to that stage
"What we had was banks throwing money at people - not only throwing money at people, those individual applicants didn't have to put any collateral forward whatsoever".
Mr Mulholland denied Mr Lynn is trying to shift any blame and that his client "has faced the music".
