“We believe that a good agreement should be reached so it means that we do not feel pressed for time,” Mohammad Javad Zarif said on Saturday.

Iran's top negotiator said that Tehran and its negotiating partners might need more time to strike a final agreement.

'The July 1 deadline could be pushed forward a few days until a final agreement is reached,' he added.

“We want to proceed with [the talks] until we reach a conclusion. This is, in my opinion, a better approach than extending [the negotiations],” Zarif said.

Zarif further criticized that the six world powers for making excessive demands in the course of talks, stressing, however, that Iran will not cave in to their pressures.

“We have proved that we will stand up to excessive demands,” Zarif stated.

Representatives from Iran and the P5+1 – the United States, the UK, France, China and Russia plus Germany – are holding extensive talks to finalize the text of a possible deal over Tehran’s nuclear program by end this month.

The two sides seek to reach a comprehensive final deal based on the mutual understanding on the key parameters agreed upon in the Swiss city of Lausanne on April 2.

On Saturday, Iranian Deputy Foreign Ministers Abbas Araqchi and Majid Takht-e-Ravanchi sat down with European Union Political Director Helga Schmid to continue talks on the draft of the text of a final deal. Wendy Sherman, who is under secretary of state for political affairs at the US State Department, then joined the talks in the Austrian city of Vienna.