Opposition TDs Catherine Murphy and Pearse Doherty say they have fresh details of other large IBRC account holders - and have suggested they are likely to reveal them.
Mr Doherty said he would consider releasing further information about large IBRC (Irish Bank Resolution Corporation) debtors if he deemed it to be in the public interest.
Ms Murphy has also said she has details of other IBRC accounts and account holders who may have received significant debt write-downs.
They spoke as Finance Minister Michael Noonan refused to accept demands from them to widen the terms of reference of the new Commission of Investigation into IBRC and the sale of Siteserv.
Their comments come after weekend reports that between €1bn and €1.2bn was written off for 40 customers, both businesses and individuals.
Speaking outside the Dail, Mr Doherty said that what he placed on the record of the Dail was only a portion of what was contained in documents he received last weekend.
"If it is needed for more information to be put into the public domain to convince the Government that the terms of reference need to be extended, then that is something I am willing to do," he said.
Mr Doherty said he had passed the documents he had to the Taoiseach for the purpose of giving them to the commission as it began its work.
"I have information about other accounts as well," said Ms Murphy.
Mr Noonan insisted that all of the concerns raised by Mr Doherty into the sale of Siteserv were addressed by the terms of the commission, and for this reason the terms do not need to be expanded.
Mr Noonan told the Dail that retired High Court judge Daniel O'Keeffe would head the new commission.
He was speaking as the Dail voted by a margin of 119-20 to establish the investigation into IBRC.