The state-run Anadolu news agency said the plan aims to expand a ceasefire in the city of Aleppo -- brokered by Turkey and Russia earlier this month to allow the evacuation of civilians -- to the whole country.
If successful, the plan would form the basis of upcoming political negotiations between the Damascus regime and the opposition, overseen by Russia and Turkey in the Kazakh capital Astana, it added.
A Syrian rebel source, who asked not to be named, told AFP in Beirut that details still had to be submitted to opposition fighters and said there was no agreement as yet.
"The armed revolutionary factions have not received any official proposal for a ceasefire in Syria," Labib Nahhas, head of foreign relations for the powerful Ahrar al-Sham rebel group added on his official Twitter account.
Anadolu said both sides were working for it to come into force at midnight but gave no further details.
Ankara and Moscow have been on opposing sides in the Syrian civil war, with Turkey seeking the ouster of President Bashar al-Assad, who is backed by Russia and Iran.
But the two countries have recently started to cooperate more closely on Syria, especially after a deal in the summer to normalise ties battered by Turkey's shooting down of a Russian warplane last year.
Turkey remained conspicuously quiet as Assad's forces, backed by Russia, took control last week of Aleppo in the biggest defeat so far for the rebels in the civil war.
Qatar-based channel Al-Jazeera said a new meeting is planned on Thursday in Ankara, this time between military representatives of Syrian rebels and Russia.
No date has yet been set for the Astana talks and Russian foreign ministry spokeswoman Maria Zakharova said the meeting was still at the planning stage.
She emphasised that the talks were not intended to replace the peace process based in Geneva which has sought to find a solution for the Syrian conflict.
But the direct involvement of Turkey and Russia comes as Erdogan is increasingly expressing impatience at the role of the United States in Syria.
It remains unclear how the latest ceasefire plan will apply to Fateh al-Sham, formerly the Al-Qaeda affiliate Al-Nusra Front, which has worked more closely with the rebels since changing its name.
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