Zarif is scheduled to participate in the third round of Syrian talks on Saturday at the venue of Imperial Hotel in Vienna.
Araghchi, who heads the JCPOA Follow-up Commission, will meet Helga Schmid in Vienna on the redesigning of Iran's heavy water reactor in Arak.
The first round of Vienna talks on Syrian crisis was held in the presence of Saudi Arabia, the US, Russia and Turkey.
The second round, however, was attended by the Iran's Foreign Mohammad Javad Zarif on invitation of Western sides.
Held on October 30 in Austrian capital, the meeting was wrapped up with participants agreed upon a scheduled framework as the 9-clause statement.
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