Iran's nuclear deal could come in the next four months.
Iranian Foreign Minister Mohammad Javad Zarif told the visiting EU foreign policy chief, Catherine Ashton.
Zarif held talks lasting more than an hour with Ashton, who is making her first visit to Tehran amid deteriorating relations.
According to the BBC, Zarif said that Iran could strike a deal in four or five months and even shorter.
Ashton however cautioned there was 'no guarantee' her talks would lead to a comprehensive agreement.
In November, Ashton helped broker a deal to curb Iran's nuclear programme in return for limited sanctions relief.
At a joint news conference with Zarif, Ashton said the interim agreement is really important but not as important as a comprehensive agreement, which is difficult and challenging, adding that there was no guarantee that they will succeed.