Syria's opposition is edging towards agreeing to international peace talks in Geneva.
It is seeking approval from fighters inside the country first to give the process more legitimacy, its spokesman said at talks in Istanbul.
The leadership of the Syrian National Coalition is meeting to agree its stance on the "Geneva 2" talks.
Geneva 2 talks aim to end Syria's two-and-a-half year civil war by creating a transitional governing body.
A draft resolution reaffirms the coalition's commitment to a political solution to the conflict.
It echoes a declaration in London last month by the Friends of Syria pro-opposition alliance ruling out any role for President Bashar al-Assad in a transitional administration.
The 108-member coalition is to due vote on the resolution, with 50% plus one vote needed for it to pass.
But the opposition said coalition members want to seek the backing of rebel fighting units, community leaders and activists inside Syria.
This is for the resolution, to counter criticism that they are out of touch with those battling on the ground.
A team will be sent into Syria to gather views.
Major Islamist rebel brigades have declared their opposition to the Geneva process if the conference does not result in President Assad's removal.
Some have said they would charge anyone who attended the planned international talks with treason.
"One delegation will actually be going down to Syria. It's going to be meeting with different FSA (Free Syrian Army) brigades, having a discussion with them around Geneva," said National Coalition spokesman Khaled Saleh.
"If we're going to be in Geneva, they are going to be part of that delegation," he said of the rebel units. The delegation will also meet with civilian groups.
One member of the Syrian National Council, a grouping within the coalition, said that a draft resolution already contained tough conditions for participation in the conference, but those on the ground might want to tighten them further.
That could mean a delay.
While some sources said that a final decision could take up to two weeks, Mr Saleh said it was a "quick process".
"We already started this over the last two weeks. Quite a few of us have been travelling back and forth.
A few of these representatives will be coming in the next couple of days," he said.
US envoy Robert Ford met the coalition's senior leadership in Istanbul before their meeting to push them to approve the Geneva talks, coalition members said, and diplomats and other foreign officials said they were optimistic.
"We want them to come to the decision on their own and think about it properly. It has to have support of the Syrian people,"one senior Western diplomat said.
The proposed peace conference is meant to build on a June 2012 agreement among world powers in Geneva that called for a transitional authority with full executive powers, but left open the question of whether Assad could play any part.
An opposition source said the draft resolution also had conditions including the release of opposition detainees, and an end to air raids and to blockades on food and medicine imposed by Assad's forces on opposition areas.
Even if the coalition votes to attend the peace talks, it still has to form a broad delegation which Washington wants to include some of the coalition's rivals within the opposition.
Opposition sources say the coalition's leadership has agreed to a proposal by the Syrian Democratic Union bloc to convene a meeting on 23 November to discuss Geneva with other opposition groups, including some tolerated by the Assad government.