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Iran has opened a direct line of communication with rebels in Syria's new leadership since its ally Bashar al-Assad was ousted, a senior Iranian official told Reuters on Monday, in an attempt to "prevent a hostile trajectory" between the countries.

The lightning advance of a militia alliance spearheaded by Hayat Tahrir al-Sham, a former al-Qaeda affiliate, marked one of the biggest turning points for the Middle East in generations. Assad's fall as president removed a bastion from which Iran and Russia exercised influence across the Arab world.

Hours after Assad's fall, Iran said it expected relations with Damascus to continue based on the two countries' "far-sighted and wise approach" and called for the establishment of an inclusive government representing all segments of Syrian society.

There is little doubt about Tehran's concern about how the change of power in Damascus will affect Iran's influence in Syria, the lynchpin of its regional clout.

But there is no panic, three Iranian officials told Reuters, as Tehran seeks diplomatic avenues to establish contact with people whom one of the officials called "those within Syria's new ruling groups whose views are closer to Iran's".

"The main concern for Iran is whether Assad's successor will push Syria away from Tehran's orbit," a second Iranian officials said. "That is a scenario Iran is keen to avoid."

A hostile post-Assad Syria would deprive Lebanese armed group Hezbollah of its only land supply route and deny Iran its main access to the Mediterranean and the "front line" with Israel.

One of the senior officials said Iran's clerical rulers, facing the loss of an important ally in Damascus and the return of Donald Trump to the white House in January, were open to engaging with Syria's new leaders.

"This engagement is key to stabilise ties and avoiding further regional tensions," the official said.