Iranian Foreign Minister Mohammad Javad Zarif (R) talks to journalist from a balcony of the Palais Coburg hotel where the Iran nuclear talks are being held in Vienna, Austria July 10, 2015. [Photo/Agencies]

VIENNA - Iranian foreign minister on Sunday said there would be still work to do on Monday on a comprehensive agreement on the Iranian nuclear issue, but no extension of the talks.

From the balcony of Palais Coburg hotel in Vienna, Iranian Foreign Minister Mohammad Javad Zarif told reporters that there is still work to do on Monday, hinting that there might be no deal on Sunday, adding that there would be "no extension" of the negotiations.

Sides have been negotiating for 15 days in Vienna to finalize a comprehensive deal on the Iranian nuclear issue.