The Tanaiste says it is surprising that a letter from the former Garda Commissioner was not brought to the attention of the Justice Minister sooner.
The correspondence on garda taping from Martin Callinan was received in the Department of Justice two weeks before Alan Shatter was informed.
Eamon Gilmore says he expects the Cabinet will discuss the terms of reference for the Commission of Investigation at its meeting tomorrow.
He says the delay in presenting Minister Shatter with the letter will be one of the issued examined by the Commission.
The Transport Minister also said earlier that the former Garda Commissioner should have told Mr. Shatter about illegal garda taping sooner.
Leo Varadkar says Martin Callinan should have informed Minister Shatter about the taping in November, as soon as it was stopped.
He says it is a matter of concern that the former Commissioner knew of systematic taping for four months before asking that the Minister be informed:
However one of Minister Varadkar's Cabinet colleagues has said politicians should not rush to judgment about the handling of the tapes.
Jobs Minister Richard Bruton says the ndependent Commission of Inquiry should be allowed to reach its own conclusions.
Meanwhile the Justice Minister has opted not to answer media questions on the garda tapes controversy this morning.
Alan Shatter is at the Convention Centre in Dublin to attend and address a series of citizenship ceremonies - but his spokesperson says he ius 'too busy' to take questions from reporters at the event.
The Minister is under pressure to explain whether he knew about the existence of tapes relating to the Ian Bailey case.
It follows weekend reports that phone conversations with two of the main witnesses in the Sophie Toscan du Plantier murder case were recorded during the investigation in December of 1996.
The Supreme Court rejected a French extradition request for Ian Bailey in 2012 and Alan Shatter has already confirmed he was consulting with the Attorney General on documents handed over to Bailey's legal team the previous year.
Those documents include a report from the Director of Public Prosecutions (DPP) that found no grounds to prosecute Mr. Bailey for the murder.
