Fianna Fáil TD John McGuinness has said senior Government figures "must have known more than they are admitting" about the problems at Anglo Irish Bank.
The Sunday Independent has claimed David Drumm, former CEO of Anglo, personally informed the Taoiseach Brian Cowen about issues at the bank in April 2008.
That is five months before the Government introduced the €440bn deposit guarantee scheme.
Mr Cowen has consistently denied that he, or any of his colleagues in Government, were aware that Anglo Irish Bank was insolvent, prior to its inclusion in the scheme.
Mr McGuinness said: "I think that an awful lot of people involved, including the Department of Finance, so you can extend that to include Brian Cowen, must have known a lot more about what was going on around that time in relation to the banking system."