Iran's ISNA news agency has said parliament speaker Mohammad Baqer Qalibaf is to head the Iranian negotiating team for talks in Islamabad with US Vice President JD Vance.
Iran's Supreme Security Council said the negotiations would begin on Friday.
Meanwhile, sources have said that Iranian Foreign Minister Abbas Araghchi is also set to reach Islamabad for the talks.
Qalibaf, long seen as a protégé of late Supreme Leader Ayatollah Ali Khamenei and a confidant of his son Mojtaba, who has succeeded to the position of supreme leader, has been a leading voice of defiance against Israel and the United States.
Addressing Trump and Netanyahu after the killing of Khamenei on the first day of the war, he promised "such devastating blows that you will be begging".
"I say to these two dirty criminals and their agents: you have stepped on our red line and you have to pay for it," he declared in a television speech at the time.
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That fiery rhetoric reflects his longstanding position as a fierce disciple of the Islamic Republic's theocratic system of government, a stance he has also demonstrated through helping to crush displays of internal dissent.
Yet despite that hardline profile, Qalibaf has also built a reputation as a moderniser and pragmatist, posing during his 2005 presidential run in his uniform as a qualified pilot for campaign adverts to bolster his image as a professional.
Earlier, Prime Minister Shehbaz Sharif had announced that both the United States and Iran had agreed to an immediate, global ceasefire following Pakistan’s diplomatic intervention, paving the way for further negotiations in Islamabad.
In a post on X, PM Shehbaz confirmed that the ceasefire is effective immediately and extends to all areas of conflict, including Lebanon and other regions.
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“With the greatest humility, I am pleased to announce that the Islamic Republic of Iran and the United States of America, along with their allies, have agreed to an immediate ceasefire everywhere, including Lebanon and elsewhere, EFFECTIVE IMMEDIATELY,” he wrote.
The prime minister invited delegations from both countries to Islamabad on Friday, April 10, to negotiate a “conclusive agreement” aimed at settling all disputes and ensuring long-term peace and stability.
“I warmly welcome the sagacious gesture and extend deepest gratitude to the leadership of both the countries and invite their delegations to Islamabad… to further negotiate for a conclusive agreement to settle all disputes,” PM Shehbaz said.
