Even if the EU blacklists the military wing, the bloc wants to maintain contact with Lebanese political parties. Assurances of political outreach are essential to any terror blacklisting and have been instrumental in tipping the balance, according to three officials who said they were forbidden from speaking publicly on the issue ahead of Monday's ministerial meeting.
The senior EU official said the ministers will consider the listing based only on evidence that Hezbollah was involved in a 2012 attack in the Black Sea resort of Burgas in Bulgaria, which killed five Israeli tourists and one Bulgarian last year. Hezbollah denies it is responsible.
The discussion is also fueled by a Cyprus criminal court decision in March finding a Hezbollah member guilty of helping to plan attacks on Israelis on the Mediterranean Island.
Implementation of the listing would be complicated because diplomats would have to unravel the links between the different wings within Hezbollah's organizational network and see who could be targeted with visa bans or asset freezes.