Up to 2,500 fighters from Europe remained on the battlefield but their massive return in the short term seemed unlikely, according to the report seen by AFP.
Belgium expressed concern last month that jihadists were increasingly returning to Europe as US-backed coalition forces drive the Islamic State (IS) group from territory in Syria and Iraq.
The report said between 15 to 20 per cent of the Europeans have died on the battlefield, around 30 to 35 per cent have returned and 50 per cent remain in the battle theatre, which amounted to between 2,000 and 2,500 Europeans.
The report said there were two types of "foreign terrorist fighters" returning.
"Those in the majority that will drift back, and those who will be sent back on specific missions, which are of most concern," the report warned.
It said even some European women and children born or raised in the so-called caliphate declared by IS in Iraq and Syria could pose a security threat as they may have been radicalised.
It recalled that foreign fighters who have returned to Europe have staged both foiled and successful attacks, including the slaughter in Paris in November last year and this year's bombings in Brussels in March.
Both sets of attacks were claimed by IS, which is also known by its Arabic acronym Daesh.
"There is also a significant foreign terrorist fighter contingent with Daesh in Libya which might attempt to use their nationality or family connections to return to Europe," the report said.
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