The Taoiseach Enda Kenny has called on David Drumm to cooperate fully with the Banking Inquiry.
Mr Kenny says the former Anglo Irish Bank chief executive should follow any direction given to him by the inquiry committee.
Mr Drumm is scheduled to give evidence to the inquiry next Wednesday, but he has asked to do so via videolink from the United States.
The Inquiry is now seeking legal advice as to whether to accept Mr Drumm's evidence remotely.
He has informed them he would not be appearing in person on Wednesday, as initially directed.
He has already supplied a written statement to the Inquiry.
Mr Drumm is now resident in the United States, where he is not subject to compellability orders from the Inquiry.
But Mr Kenny has made it clear that if the inquiry tells Mr Drumm to attend in person, he should do so.
Sinn Féin's finance spokesperson Pearse Doherty is a member of the Banking Inquiry.
He told Newstalk Breakfast earlier that the committee has not yet seen Mr Drumm's written evidence.
But his Fianna Fáil counterpart Michael McGrath is totally opposed, and says Mr Drumm must give evidence in person.