Iran's top diplomat Mohammad Javad Zarif will visit Kuwait, Qatar and Iraq this weekend, the ISNA press agency said Friday, following a landmark nuclear deal between Tehran and world powers.

The accord, struck on July 14, which imposes certain controls on Iran's nuclear programme in exchange for a lifting of crippling economic sanctions, is expected to form the basis of discussions during Zarif's trip.

Gulf countries led by Saudi Arabia have been quick to voice concern over the agreement, which will see a progressive easing of international sanctions on Iran in place since 2006.

They fear the deal could bolster their Shiite-dominated adversary, which stands accused of interfering in countries such as Iraq, Syria and Yemen.

Zarif is expected to visit the holy Shiite town of Najaf in Iraq on Sunday before heading to Baghdad, according to ISNA.

The Iranian foreign minister will return to Tehran next week where he will host talks with EU foreign affairs chief Federica Mogherini before meeting his French counterpart Laurent Fabius.