Iran's ambassador to Lebanon has alleged that the United States has established specific conditions regarding Iran's future role in Syria, following the fall of the Assad regime.

Ambassador Mojtaba Amani stated on his social media account that the United States, following its representative's meeting with interim Syrian leader Ahmed al-Sharaa, has stipulated that any new Syrian government must exclude Iran from having any role in establishing positive relations with Washington.

In his statement, Ambassador Amani drew parallels with previous US diplomatic engagements in the region, particularly citing American interactions with the Muslim Brotherhood between 2011 and 2013.

Amani, who lost his eye and fingers in Israel's pager attack on Hezbollah and has since returned to his post in the Lebanese capital, has been a key player between Tehran.

He specifically referenced similar conditions allegedly presented to former Egyptian President Mohammed Morsi.

"When they saw Morsi was isolated, the time for American betrayal arrived. What was meant to happen occurred, and fate took its course," Amani wrote, suggesting a pattern in US diplomatic approaches to regional allies.

The comments emerge against the backdrop of long-standing Iranian involvement in Syria, where Tehran removed its troops and most diplomatic staff. 

Earlier on December 21, Tehran announced the death of one of its remaining employees in Damascus, who was reportedly killed in a sniper attack. 

The US State Department has not yet responded to these claims about conditions for future Syrian-American relations.