The investigation into Anglo Irish Bank is to examine lending to Sean Quinn and family, which was used to partly maintain his 25% holding in the bank's shares.
In a statement to RTÉ News, the Quinn Group said Quinn family assets were financed from cash and from a number of financial institutions, including Anglo Irish Bank.
It stressed its borrowings are always repaid and there was 'no impropriety regarding the family's dealings in any transactions relating to any of its investments, including Anglo Irish Bank.'
Sean Quinn held a 25% position in Anglo Irish Bank through contracts for difference, which allow investors borrow money from a stockbroker who purchases shares on their behalf.
However, when the shares fall the broker asks the investor to put up more money in what is know as a 'margin call'.
It is understood when the Quinn family received these calls in relation to its Anglo investment, some of this money came from Anglo Irish Bank itself.
There are significant restrictions on any bank extending loans for the purchase of shareholdings their own bank.
In August 2008 Sean Quinn confirmed that he had converted his 25% CFD position in Anglo Irish Bank into ordinary shareholding of 15% in Anglo which would be held by his wife and five children.
It was reported at that time that Sean Quinn agreed loans with Anglo secured on a significant part of his business.
However, RTÉ News has learned that financing of the 25% position prior to August 2008 is also being investigated by as part of a wider probe into activities at Anglo Irish Bank.
Today in a statement the Quinn Group said 'The Quinn family assets, which are held outside of the Quinn Group, have over the years been financed from a number of sources including related party loans from the Group, internally generated cash, and finance from both Irish and international financial institutions, including Anglo Irish Bank.
'As previously stated, there has been absolutely no impropriety regarding the family's dealings in any transactions relating to any of its investments, including Anglo Irish Bank, and we have no doubt that the current investigations will prove this.'
A spokesman for Anglo Irish Bank said: 'The bank cannot comment on any customer affairs due to customer confidentiality obligations.'
