The al-Qaida-linked group said its fighters and suicide bombers are awaiting the fighters of the Euphrates Shield.
"Regarding the fate of terrorists after the liberation of Idlib, there could be several scenarios - some groups may integrate into the Syrian military, some other groups may continue minor activities in certain areas or lay down their arms in exchange for some political concessions", Orhan said.
Turkey is cooperating with Russian Federation during its military operation in Syria's northern Idlib province, Turkish Prime Minister Binali Yildirim said on Sunday.
The new operation in Idlib will pave the way for establishing a planned "de-escalation" zone in the province, where Erdogan has said Turkey would deploy troops, but the HTS terrorists have pledged to keep fighting.
"There is a serious operation in Syria's Idlib today, and this will continue", Erdogan told members of his AK Party in a speech.
"In fact, the resolution of the Idlib situation would mean the untangling of the Syrian knot", Mahalli said.
"We will absolutely not allow the creation of a terror corridor along our borders", Erdogan, whose country is well known for backing anti-government militants throughout the war In Syria, said.
The Hurriyet daily said ultimately Turkey would ensure security in Idlib city and Russian Federation in the surrounding area.More news: Manchester United told they've not done enough to win the Premier League
Some mortar rounds slammed near the Deir Hassan camp for Syrian displaced people on the border area in northern Idlib, amid a state of fear among the people there. It said the operation was yet to formally begin.
A Syrian rebel commander told AFP on Saturday that the Ankara-backed operation in Idlib aimed to drive Tahrir Al Sham from the entire province.
"When you enter a boxing match, you don't count how many punches you will throw", Erdogan said.
TRT World's Sara Firth, who is in the southern Turkish province of Hatay on the Mediterranean coast, explains the latest efforts to build a safe zone in northern Syria.
And it has seen its ranks rapidly depleted in advance of the expected Turkish operation, with its coalition now effectively reduced back down to Fateh Al Sham.
Earlier in the day, Turkish President Recep Tayyip Erdogan announced that Turkey was conducting an anti-terror operation in Syria's Idlib.
Two waves of air strikes on Idlib killed at least 13 civilians over the past 24 hours, a Britain-based monitoring group said on Saturday. Turkey has supported and backed rebels that seek the toppling of Assad.
Rami Abdulrahman, head of the Observatory, said that the rebel alliance was sending reinforcements to the border area.