Former taoiseach Brian Cowen has confirmed his attendance at the banking inquiry for two days in early July.
However, the committee has not yet agreed on whether to call Taoiseach Enda Kenny as part of its inquiry of opposition policies during the banking crisis.
That issue expected to be decided next week.
The inquiry will hear from opposition finance spokespeople with notifications going next week to former taoiseach Bertie Ahern as well as Richard Bruton and Joan Burton.
They are expected to give evidence in July.
It is understood Fianna Fáil members have asked for Mr Kenny to be called but there has not yet been agreement.
Mr Cowen, who led the government during the main part of the banking crisis and the bailout, will give evidence on Thursday 2 July and Wednesday 8 July.
Former finance minister Charlie McCreevy has been confirmed for Wednesday 1 July.
Remaining bankers to be notified next week include former Irish Nationwide CEO Michael Fingleton and chairman Michael Walsh along with Anglo Irish Bank's David Drumm and Dennis Casey and Gillian Bowler from Permanent TSB.
On Mr Drumm, an inquiry source said they were aware of difficulties given that he is outside the jurisdiction.
The inquiry is also still working on a format where Troika members, the IMF and the European Commission, could give evidence.
Neither body has confirmed but neither has refused and engagement is ongoing.
The formats could be similar to that of the questioning of former ECB chief Jean-Claude Trichet last month.
