Zarif was yesterday in Lebanon, which neighbours war-torn Syria, and said that his country is not seeking an invitation at all costs to the peace conference to be held in Switzerland on January 22.
He is visiting Lebanon as part of a regional tour that will also take him to Iraq, Jordan and Syria, Iran's official Al-Alam Arabic-language television said, without giving further details.
"If we receive an invitation without any preconditions, we will participate in the 'Geneva 2' peace conference, but we won't act in order to receive an invitation," Zarif said in Beirut.
US Secretary of State John Kerry and Russian Foreign Minister Sergei Lavrov are to meet today in a bid to decide Iran's role in ending the nearly three-year conflict.
Speaking in the Lebanese capital yesterday, Zarif also said Iran would "welcome any official meeting" with Saudi Arabia, which supports opponents of Assad in the Syrian civil war.
"We try to have brotherly ties with this country... because we believe that if our relationships strengthen, it will have a positive effect on the stability, security and peace in the entire region."
Majid al-Majid, a Saudi who was suspected to be the head of the Abdullah Azzam Brigades which claimed the attack, died in Lebanese custody this month.
The embassy attack came amid rising tensions in Lebanon over the role of the Iran-backed Shiite movement Hezbollah in the war in neighbouring Syria.
