"I can not say when Israel is going to attack Lebanon, if it is going to be soon or not. It depends on the region's events and circumstances," said Nasrallah, whose Lebanese Shiite group is backed by Damascus and Tehran.
"On the one hand it depends on Iran's nuclear case, and on the other hand it depends on the indirect talks between Syria and Israel," he added.
He was referring to the Iranian nuclear drive which the West suspects is a weapons programme under the guise of a civilian one. It has already imposed sanctions on Teheran and Washington refuses to rule out the use of force.
Tehran vehemently denies it is developing nuclear weapons.
Israel and Syria, which have technically been at war for 60 years, launched indirect negotiations brokered by Turkey in May, eight years after talks were frozen over the fate of the Israeli-occupied Golan Heights.
Nasrallah assessed the current situation in the Middle East as "not stable and not calm", but he added that Hezbollah's "military situation is in best shape, thanks God."
Iran is a staunch supporter of Hezbollah although it denies Western and Israeli charges of military backing to the militant group which fought a devastating 2006 summer war against the Jewish state.
