The Lebanese Hezbollah group believes it can still count on Iran's support following Tehran's nuclear deal with world powers, leader Hassan Nasrallah said on Saturday.

In his first public remarks since the agreement was reached this month in Geneva, Nasrallah said he was sure Tehran would confound critics who say it would end support to Hezbollah.

"We deal with every trust and complete assurance over this Nasrallah said in cerermony to honour sons and daughters of fallen Hezbollah fighters.

Speaking before a graduation event in southern Beirut, Nasrallah also said that he was "proud" of U.S. sanctions targeting three members of the group. Such sanctions, he said, do not make the slightest difference to the group.

The U.S. Treasury Department slapped sanctions last week on three Hezbollah members, including senior figure Mustafa Badr al Din, and a Lebanese businessman for their suspected militant activities in support of Syrian President Bashar Assad.

The action freezes the U.S. assets of all four and prevents Americans from engaging in transactions with them.

"This does not make a slightest difference to our brothers," Nasrallah said. He said Hezbollah members did not have money in international banks or otherwise.