Zarif then will visit Brussels, Belgium on March 16 to participate a meeting with the British, French, German foreign ministers, Afkham added.
EU foreign affairs head Federica Mogherini will lead the EU side delegation in the meeting, she said.
The spokeswoman further said that Zarif would join the negotiations in Switzerland after ending the Brussels meeting with the EU side.
While responding a question about Iranian delegation members, Afkham said that The Iranian team would remain unchanged from the last round of talks.
In latest round of nuclear talks which was held last week in the Swiss town of Montreux, Iran and the US also brought their nuclear energy chiefs to the negotiations to cover the technical side, in addition to high-ranking diplomatic officials.
Ali Akbar Salehi, the head of Iran`s Atomic Energy Organization and US Energy Secretary Ernest Moniz as well as Iranian Deputy Foreign Ministers Abbas Araqchi and Majid Takht Ravanchi and Hossein Fereydoun, the younger brother of Iran’s President Hassan Rouhani and his special aid participated in the talks.
Iran and the P5+1 are aiming to reach a political understanding by March 31 in the run-up to a comprehensive deal by July 1 deadline. After the sides failed to meet the November 24, 2014 deadline they also extended the Geneva nuclear deal, which was signed in November 2013 to provide Iran with some sanctions relief in exchange for Tehran agreeing to limit certain aspects of its nuclear activities.
The US and its Western allies suspect Iran of developing a nuclear weapon - something that Iran denies.
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