The High Court has been urged not to halt a case taken by the Irish Bank Resolution Corporation against the former CEO of Irish Nationwide Building Society over the alleged negligent mismanagement of the Society's affairs.

Michael Fingleton's lawyers told the court that the 83-year-old had suffered a severe stroke in May 2018, leaving him mentally and physically incapacitated.

They said assessments have shown a declining cognitive ability particularly affecting his short term memory and ability to critically assess evidence.

His solicitor Niall Clerkin said Mr Fingleton's ill health plus the breadth of the case were exceptional reasons to halt the case.

IBRC claims Mr Fingleton enjoyed "excessive" control over Irish Nationwide's business and made several loans of more than €1m without consulting the board.

These claims are "hotly contested" by Mr Fingleton, the court heard.

IBRC says Mr Fingleton's ill health is not a basis to stop the case.

Senior Counsel Lyndon MacCann said documentary, objective, witness and expert evidence would be crucial in the case rather than Mr Fingleton's "subjective" evidence.

IBRC claims Irish Nationwide's €6bn in losses between 2008 and 2010 arose from development loans made when Mr Fingleton was CEO.

It claims if the true picture had been disclosed, Mr Fingleton would have been dismissed for breach of duty by 2007 and would not have been paid expenses and performance bonuses for 2008 and 2009.

The hearing before Mr Justice Tony Hunt will continue tomorrow.