The peace talks, the first between the Syrian government and the opposition since 2012, are scheduled to open in Geneva on January 25, but invitations have yet to be sent to the delegations.
The 17 countries pushing for a peace deal, including the United States, Russia, Saudi Arabia and Iran, have been struggling to agree on the list of opposition leaders who will have a seat at the negotiating table.
"At this stage, the UN will proceed with issuing invitations when the countries spearheading the international Syrian Support Group process come to an understanding on who among the opposition should be invited," said UN spokesman Farhan Haq.
UN Secretary-General Ban Ki-moon "urges those countries to redouble efforts to reach that agreement," he said.
The Geneva talks are to pave the way to a new constitution and elections in 18 months to end Syria's nearly five-year war, which has killed more than 260,000 people and triggered a mass refugee exodus to Europe.
The UN spokesman said there were "concerns about arrangements" that had yet to be resolved for the talks to go ahead and added, "If there is any kind of slippage, we will let you know."
A council diplomat separately said "it's going to be difficult" to reach agreement on the list of participants.
Saudi Arabia last month hosted a meeting of armed factions and opposition groups to agree on a common platform in negotiations with the Damascus regime, but Russia has said that effort did not include all players.
A key ally of the Syrian regime, Moscow wants the moderate opposition that is closer to President Bashar al-Assad to take part.
"If some well-known opposition leaders are not invited, it's going to make the delegation less inclusive than it should be," said Russian Ambassador Vitaly Churkin.
The UN's Syria envoy, Staffan de Mistura, told the UN Security Council during a closed-door briefing that "additional work needs to be done" before he can send out invitations, Churkin told reporters.
But he added that January 25 remained the target and that it was "important to stick to that date".
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