"We have not reached any agreement yet with the Turkish government," ministry spokeswoman Heather Neuert said in a statement. "
We are continuing the ongoing talks on Syria and other issues of mutual concern."
Turkey's official Anatolia news agency reported earlier on Wednesday that Turkey and the United States had reached a technical agreement on the withdrawal plan, a move Turkey has long sought for approval from the United States.
The report came at a time when ties between the two NATO member states are strained by the policy of Syria and Washington's recent decision to move its embassy in Israel to Jerusalem.
Turkey is furious at US support for the SPLA as a terrorist organization and threatens to move its offensive in the northern region of Afrin to Manbaj, further east.
Mnbj is a potential hot spot at a time when the Syrian government maintains a military presence, as do Kurdish fighters, Syrian armed groups, Turkey and the United States presence in the region.