Mr Lynn, who has been on the run since 2007 and is facing €80m property fraud charges, was finally arrested on Thursday after secretive talks between Irish and Brazilian police.
Mr Lynn’s solicitor, Eloy Maury, said that he will attempt to block the extradition during a Brazilian Supreme Court hearing — which will be attended by Garda Bureau of Fraud Investigation officials — over the coming days.
However, should this last-ditch attempt to stop the return of his client to Ireland fail, Mr Lynn could be brought back to this country to face trial by the end of the week.
While there is no extradition treaty between Ireland and Brazil, a rarely cited agreement between both countries allows for suspects to be extradited on a “reciprocal” case by case basis.
As a result, while Mr Lynn. 44, has Brazilian citizenship as his son was born to his Irish wife Bríd in the country last year, he cannot avoid charges dating back to the Celtic Tiger era property fraud claims.
Since fleeing Ireland in 2007, Mr Lynn had lived in Portugal, Hungary, Bulgaria, and the US.
Since 2011, he has been living in Pernambuco, in the north eastern Greater Recife region of Brazil. He was not living under an assumed identity and told locals he came to the country to escape the financial crisis in Europe.
In 2008, the Law Society of Ireland struck-off Mr Lynn due to the serious allegations made against him, while in 2011 the High Court issued a warrant for his arrest.
He stands accused of €80m worth of property fraud involving multiple mortgages on more than 180 different properties.
The deals left individual investors tens of thousands of euro in debt.
While on the run, Mr Lynn had attempted to return to the property and construction deals sector.
He was working as an English teacher in Brazil.
Since his arrest, Michael Lynn has been forced to swap his luxury tropical villa — complete with a pool, BBQ area and patio — just 300 metres from a picturesque Brazilian beach for far less salubrious trappings.
The struck-off solicitor who is facing €80m property fraud charges is being held in the overcrowded, high-security Cotel Prison in Abreu Lima, alongside murderers, rapists and dangerous criminals.