RTÉ News has learned that the annual report of Anglo Irish Bank will reveal that a property owned by a member of Sean FitzPatrick's family was rented by the bank.
It is understood the property is in London. Government sources say the full annual report will be published on Friday.
Meanwhile, there have been angry exchanges in the Dáil over Anglo Irish Bank, with the Taoiseach accusing Fine Gael of a political smear campaign and 'juvenile conspiracy theory' against him.
Brian Cowen said suggestions that the Government was trying to protect anyone were 'totally baseless', saying they were determined to ensure that due process was followed.
He denied that the Cabinet had decided that Anglo Irish Bank should not pursue for repayment the ten individuals who borrowed money from the bank to buy its own shares. Mr Cowen said the money was still owed to the bank, and it was the Government's intention that it should be collected.
Fine Gael leader Enda Kenny said the Government had been 'far too timid' about the situation in financial institutions, because they were responsible for the failure to regulate the banks properly. He asked the Taoiseach if he agreed that a fraud had been perpetrated on the Irish Stock Exchange.
Labour leader Eamon Gilmore asked why Mr Cowen, when he was Minister for Finance, had ordered Revenue to reverse its decision to impose stamp duty on contracts for difference (CFDs).
CFDs are high-risk investment products where investors can bet on the future direction of a stock without having to actually buy the shares.
He said Mr Cowen had already confirmed he had been lobbied about the issue, and asked for the identity of those involved. Mr Gilmore added that when the decision was reversed, people continuing gambling on the stock market, because they were paying no tax.
Mr Cowen said as far as he recalled the lobbying came from a professional body, but he promised to check with the Department and supply details. But he said he had acted on official advice. Later, the Taoiseach said the Department of Finance was lobbied by the Irish Stock Exchange and by the London Investment Bank Association on the issue. The issue was also raised by Davy Stockbrokers and PricewaterhouseCoopers, he added.
A spokesman for Seán Quinn - who previously held a position in Anglo through CFDs - has said Mr Quinn did not lobby Brian Cowen on stamp duty for CFDs when Mr Cowen was Minister for Finance in 2006.