"The conference will be successful, if all countries of influence will be able to take part," he said.
"Iran received a verbal invitation to attend a future conference on Syria ten days ago."
Teheran welcomes the idea of holding such a meeting in Geneva," the senior diplomat said, Itar-Tass reported.
"The conference in Geneva is to create pre-requisites for ending the crisis," he said. "Iran will positively keep track of the issue of its participation in Geneva, despite controversial information about our participation."
Late in May, Amir-Abdollahian said that Iran will decide about its participation in the Geneva II conference in Switzerland after receiving a written invitation from the organizers of the meeting.
He said that Iran has received oral invitation to attend international Geneva meeting, but added that a written invitation has not received yet.
Amir-Abdullahian said that after receiving the written invitation, Iran will make a decision about it.
He added that in diplomatic talks Iran has declared that concerning concentration of Geneva meeting on political solution for the crisis, we consider every invitation with a positive view.
The Russians and Americans agreed during Kerry's visit to Moscow to set up a conference of international players to end the crisis in Syria. Moscow wants to involve all the nations which took part in the Geneva conference on Syria last summer, and says without Iran's participation the conference cannot succeed.
Early in June, Russia's Foreign Minister Sergei Lavrov once again underlined that Iran should take part in the upcoming Geneva II Conference.
"This issue is not related to the Syrians alone, as there are a number of foreign players involved at that crisis as well, and therefore, Iran's presence at that conference is of key importance for us," Lavrov said.
"In my talks with the US and French foreign ministers John Carry and Lauran Fabio aimed at solving the ambiguities about the combination of participating countries at Geneva II International Conference on Syria I gained their approval on need for revising their former decision," he added.