Comprehensive material will be provided by the Department of Foreign Affairs on Monday on the proposed appointment of former minister Katherine Zappone as a United Nations envoy, the Taoiseach has said.

Speaking at an event in Cork, Micheál Martin said he believed this will bring clarity to the issues surrounding the appointment of Ms Zappone to the role of special envoy for freedom of opinion and expression.

He also said Minister for Foreign Affairs Simon Coveney has offered to go before the Oireachtas Committee on Foreign Affairs on Tuesday so that full transparency, as is possible and necessary, will be provided,

The Taoiseach was speaking at the naval base at Haulbowline as he boarded the LÉ Samuel Beckett as part of a series of events to mark the 75th anniversary of the establishment of the Irish Navy.

Mr Martin said Mr Coveney has not briefed him in advance of his appearance before the Foreign Affairs Committee on Tuesday as he does not get involved in his presentation.

The Taoiseach added that this was a part-time envoy appointment, and while there needs to be transparency there also needs to be a sense of balance and perspective in terms of the scale of the issue.

He said he believed the presentation to the Oireachtas committee will clear up a lot of the issues.

He also said the relevant authorities and the Government cybersecurity unit were informed of the hacking attack on Mr Coveney's phone.

Earlier this week Mr Coveney said he deleted text messages he sent to Tánaiste Leo Varadkar regarding a meeting with Ms Zappone was because his phone has been hacked in the past.

Speaking to reporters in Dublin, Mr Coveney said: "I change my phone every year. I've been hacked and I'm the Minister for Foreign Affairs and Defence - so I think it's prudent that I clear my phone fairly regularly."

Mr Coveney said EU foreign ministers were contacted using his device's identity during the hack last year.

In a lengthy letter to the Chairman of the Foreign Affairs Committee, Charlie Flanagan, he insisted he was not trying to conceal texts with the Tánaiste.

Meanwhile Sinn Féin is calling for full disclosure of all information relating to Ms Zappone's appointment and it has said Mr Coveney has many questions to answer.

Sinn Féin spokesperson on Foreign Affairs and Defence, John Brady, wants "all communications records" relating to the affair to be made available to the members of the committee immediately.