The presidential election will take place on Friday, October 24.
It is understood that housing minister James Browne will bring a memo to Cabinet on Wednesday confirming the polling date.
Mr Browne is understood to have spoken to Taoiseach Micheál Martin, Tánaiste Simon Harris and junior transport minister Sean Canney on Tuesday afternoon about the date.
A presidential election must take place in the 60 days before the second term of Michael D Higgins ends on November 11.
To be eligible to run, a candidate must be nominated either by 20 members of the Oireachtas or four local authorities.
They also must be an Irish citizen over the age of 35.
Heather Humphreys, a former minister and TD for Cavan-Monaghan, is the second confirmed candidate in the race and will join independent TD Catherine Connolly on the ballot paper in next month’s election.
Fine Gael confirmed on Tuesday that Ms Humphreys had reached the required threshold for nomination. She will be ratified as a candidate on Saturday, September 13.
Fianna Fáil will meet in Leinster House next Tuesday to discuss its candidate, with former Dublin GAA manager Jim Gavin and MEP Billy Kelleher both expected to receive enough support to present to the party. A secret ballot will then take place.
Sinn Féin, meanwhile, will discuss the election as its parliamentary party meets for its two-day think-in in Dublin next Monday and Tuesday. The Ard Comhairle will then meet to decide whether the party will run its own candidate or back another one.
 – additional reporting from PA