The Taoiseach, Mr Ahern, and the former minister, Senator Mary O'Rourke, are among several leading Fianna Fáil figures scheduled to appear before the Mahon tribunal next Monday.
Other senior figures scheduled to take the stand next week are: the former EU commissioner, Mr Pádraig Flynn; the former Taoiseach, Mr Albert Reynolds; and the Minister for Transport, Mr Brennan.
The former minister Mr Ray Burke, Mr Gerry Collins MEP, backbencher Mr Ned O'Keeffe, and the party's national organiser Mr Seán Sherwin are also expected to be called next week.
In what will be the among the most politically significant of the hearings, Mr Ahern will be asked about claims that he was present in Leinster House in 1989 when most of the cabinet met the British-based property developer, Mr Tom Gilmartin.
Mr Ahern has said he has no recollection of a meeting but Ms O'Rourke, who was also in the cabinet at the time, said she remembers such a meeting taking place.
The tribunal timetable says Mr Ahern's appearance next Monday will directly follow that of Ms O'Rourke, raising the prospect of a clash in evidence between the former cabinet colleagues.
While Mr Ahern's spokeswoman said last night he had not yet received formal notification of his appearance, she said he was willing and happy to attend: "The Taoiseach is very much looking forward to appearing and giving his evidence."
The long-awaited appearance of the Taoiseach follows a robust questioning of Mr Gilmartin by Mr Ahern's barrister, Mr Conor Maguire SC.
It comes as the tribunal continues its examination of claims by Mr Gilmartin that the Charles Haughey-led government in 1989 frustrated his attempts to build a major shopping development in Quarryvale, west Dublin.
It was the Cork-based developer, Mr Owen O'Callaghan, who eventually built at Quarryvale. Mr O'Callaghan is not scheduled to give evidence until after Easter.
