Naim Qassem said Hezbollah would not be the first to yield in the war against arch-foe Israel and that its capabilities were still intact, adding Israel had yet to advance after ground clashes broke out in south Lebanon seven days ago.
Qassem said Hezbollah supported efforts by Lebanon parliament Speaker Nabih Berri to secure a ceasefire.
It was the first time that the movement did not explicitly link a halt to hostilities in Lebanon with a ceasefire in Gaza, though it was not clear whether this signalled any change in stance after a year in which it has said it is fighting in support of the Palestinians.
"In any case, after the issue of a ceasefire takes shape, and once diplomacy can achieve it, all of the other details can be discussed and decisions can be taken," Qassem said in a televised speech on Tuesday.
Hezbollah's capabilities were still intact, deputy leader Naim Qassem said in an address. (EPA PHOTO)
"If the enemy (Israel) continues its war, then the battlefield will decide."
The regional tensions triggered a year ago by Palestinian armed group Hamas's attack on southern Israel have spiralled to a series of Israeli operations by land and air over Lebanon and direct attacks by Iran onto Israeli military installations.
Iran warned Israel on Tuesday against any attacks on the Islamic Republic, a week after Tehran fired a barrage of missiles at Israel.
Any attack on Iran's infrastructure would be met with retaliation, Foreign Minister Abbas Araqchi said.
Araqchi will visit Saudi Arabia and other countries in the Middle East starting on Tuesday to discuss regional issues and work on stopping Israel's assaults on Gaza and Lebanon.
Gulf Arab states have sought to reassure Tehran of their neutrality in the Iran-Israel conflict, sources told Reuters last week.
The situation in Lebanon is getting worse by the day, the EU's foreign policy chief says. (AP PHOTO)
"Our dialogue continues in regards to the developments in the region to prevent the shameless crimes of the Zionist regime in Lebanon in continuation of the crimes in Gaza," Araqchi said in a video carried by state media.
"Starting today I'll start a trip to the region, to Riyadh and other capitals in the region and we will strive to have a collective movement from the countries of the region ... to stop the brutal attacks in Lebanon."
In Lebanon, the Israeli military piled more pressure on Hezbollah, saying it was conducting "limited, localised, targeted operations" in Lebanon's southwest after announcing such operations for the southeast border area.
A World Food Programme official voiced concern on Tuesday about Lebanon's food supply, saying thousands of hectares of farmland across the country's south has burned or been abandoned.
"Agriculture-wise, food production-wise, (there is) extraordinary concern for Lebanon's ability to continue to feed itself," Matthew Hollingworth, WFP country director in Lebanon, told a Geneva press briefing, adding that harvests will not occur and produce is rotting in fields.
World Health Organisation official Ian Clarke in Beirut told the same briefing there was a much higher risk of disease outbreaks among Lebanon's displaced population.
The conflict in Lebanon has forced hundreds of thousands of people to move. (AP PHOTO)
Israel's military struck Beirut's southern suburbs overnight again and said it killed a senior Hezbollah figure responsible for the group's budgeting and logistics.
If confirmed, the death of Suhail Hussein Husseini would be the latest in a string of Israeli assassinations of leaders and commanders of Hezbollah and its ally Hamas.
In the biggest blow to Hezbollah in decades, Israel killed its leader Hassan Nasrallah with an air strike in Beirut's southern suburbs in late September.
Many Israelis have regained confidence in their long-vaunted military and intelligence after deadly blows in recent weeks to the command structure of Hezbollah.
The situation in Lebanon was getting worse by the day, the European Union's foreign policy chief, Josep Borrell, told the European parliament on Tuesday, calling for a ceasefire.
Some 20 per cent of the Lebanese population had been forced to move, he said.
