The Government will be forced into a vote in the Dáil next week on whether to set up a Commission of Investigation into NAMA.
The vote is being called by the Independents4Change group, which wants a full inquiry into the sale of its loans in the North.
Both NAMA and the government have insisted there is no claim of wrongdoing by the agency itself in how it handled its loans.
But opposition TDs say questions remain about claims of insider interference in the sale of the Project Eagle portfolio to Cerberus.