Turkey is host to over three million Syrian refugees who fled the six-year-old conflict in their home country.
Increased attacks in Syria's rebel-held Idlib province will spark a new wave of migration, Turkish Prime Minister Binali Yildirim said on Friday, calling on Russia and Iran to rein in a Syrian regime offensive near Turkey's southern border.
The Syrian regime offensive supported by Iran-backed militia has gathered pace and displaced tens of thousands of people since November, according to the United Nations.
Already host to 3 million refugees from the six-year-old conflict, Turkey fears a further influx across its border from Idlib. The northwestern province is the largest region still held by rebels driven out of other strongholds in Syria, and is home to more than 2 million people, many in need of aid.
"Carrying out increased attacks in Idlib will cause new migration waves and vicitimisation there. This is very dangerous and wrong," Yildirim told reporters after Friday prayers.
Turkey has been deploying forces inside northern Idlib and setting up bases there after agreeing with Iran and Russia to establish a "de-escalation zone" in Idlib and nearby areas.
"It is very wrong for the Assad regime to launch an offensive, without differentiating civilians, in order to gain land ... while the initiative by Turkey, Russia and Iran on a lasting peace in Syria has made progress," Yildirim said.
"We are discussing this issue with Russia and Iran, we are making our warnings regarding the potentially horrible ramifications of Assad's attacks," he said, warning that the fighting was hindering efforts to reach a political solution.
Russia aims to convene a Syria peace congress later this month, though it is not yet clear who will attend.
On Thursday, rebels launched a counter attack against regime forces and their allies in Idlib province.