Zarif on Saturday held a telephone conversation with his Afghan counterpart Mohammad Haneef Atmar.
In the phone call, Zarif congratulated Atmar on winning the Afghan parliament's vote of confidence to become the country's new foreign minister.
He also informed the Afghan foreign minister of Iran's preparedness for continued cooperation between the two sides.
Atmar, for his part, underlined Kabul's resolve for all-out promotion of relations with the Islamic Republic of Iran.