Green Party leader Eamon Ryan has said he's 'hopeful' that a government can be formed as he urged party members to approve the draft programme for government.
Fine Gael, Fianna Fail and the Green Party have been balloting members on proposals to form a new administration which took five weeks to put together.
The outcome of these ballots amongst the three parties will be announced on Friday.
If it passes, Micheal Martin will take over as Taoiseach on Saturday.
Mr Ryan believes it's a "leap" to include members of all parties and said he thinks Fianna Fail and Fine Gael will work together with the Green Party to help make changes on Ireland's climate policy.
The Green Party has the highest threshold of the three parties, needing a two-thirds majority to secure approval.
He said: "Irish people are waiting to see if a government can be formed, I hope it can. If it doesn't then the political system will be in a difficult situation. We will work our way out of it one way or another.
"The key thing is, people are still deciding and ballots are still being sent in. I'm asking members of the Green Party to vote Yes. I respect people on the No side but I am advocating for a Yes."
Amongst the proposals suggested by party leaders is a commitment to an average 7% reduction in carbon emissions every year spanning the next decade.
Mr Ryan said while a two-thirds majority is a high bar to pass the programme for government, it would lead to a more united party.
He admitted he has not looked beyond Friday and no-one has come to a decision what will happen if the programme for government is rejected by the Green Party.
When asked if he would resign as leader if the deal is rejected by party members, he told RTÉ Morning Ireland: "I haven't looked beyond Friday afternoon. If it is not agreed, the wider political system will have to come up with some alternative - my focus will be on that first and foremost and the national interest."
Fianna Fail and Fine Gael leaders have admitted there isn't a "plan B" if the deal doesn't pass and they warned of a political crisis.
Mr Ryan said no-one has discussed or agreed what would happen if the deal is rejected and working out another solution would have to be "a very rapid turnaround over the next weekend".
