A total of 15 jihadi groups are waiting in the wings to replace ISIS in Syria a think tank backed by former prime minister Tony Blair will report tomorrow.

The jihadi groups have a total of 65,000 fighters in Syria that are poised to fill the vacuum should ISIS be defeated, according to The Sunday Times.

In the report, which has been seen by MailOnline, the author's find that some of the groups have designs on attacking the west, with the number one group named as Jabhat al-Nusra, Al-Qaeda's Syrian affiliate.

'Strategic failure': The report warns Coalition strikes on ISIS are a 'strategic failure' if they don't address other extremist groups in Syria

It warns that British and coalition attacks on ISIS could be a 'strategic failure' if it overlooks other groups operating in the country and that sixty per cent of rebel groups are 'Islamist Extremists'.

Who are the other jihadi groups in Syria? Jabhat al-Nusra Founded: January 2012 Leader: Abu Muhammad al-Golani Where: Idlib and Aleppo provinces Suspected number of fighters: 10,000 Ahrar al-Sham Founded: December 2011 Where: Idlib, Aleppo, Damascuz, Deraa and Quneitra Suspected number of fighters: 15,000 Jaish al-Islam Founded: Summer 2011 Leader: Zahran Alloush Where: Arsal (Lebanon), Damascus city and province, Homs province, Latakia province Suspected number of fighters: 17,000

Liwa al-Umma Founded: April 2012 Where: Hama province Suspected number of fighters: 6,000 Advertisement

Jabhat al Nusra already controls a significant amount of territory in Syria's northwestern province of Idlib and imposed strict Islamic law having fought local rebel groups as well as forces loyal to President Assad.

The groups listed are all salafis, a strictly conservative branch of Islam and according to the report, are driven by 'Salafi-jihadism'.

'The current focus on the military defeat of ISIS does not consider the other groups in Syria [and around the world] with exactly the same global ideology and ambitions.

'Our study of 48 rebel factions in Syria revealed that 33 per cent - nearly 100,000 fighters - follow the same ideology as ISIS. If you also take into account Islamist groups (those who want a state governed by Islamic law), this figure jumps to 60 per cent.'

Ed Husain, director of strategy at the CRG told The Sunday Times that ISIS ideology has 'no border or barrier' and has already demonstrated that it can inspire its followers to 'kill just as easily in Paris as it can in Raqqa.'

'We must wake up to the fact that this is global, Unless we uproot the ideology from spreading, we will find ourselves dealing with the same problem over and over again,' he said.

The report also warns against coalition attempts to distinguish between moderate rebels and 'unacceptable extremists', because of the overlap of groups on the ground.

Given the fluid and changing nature of frontlines in Syria, groups often share resources and work together to fight Assad forces, which include Hezbollah fighters.

Jabhat al-Nusra's leader Abu Muhammad Golani denied any intention to attack the west in an interview with Al Jazeera earlier this year, however the group's spokesman Abu Firas al-Suri said the group's goals are not limited to Syria.

Jaish al-Islam, the group identified as having the most fighters at 17,000, characterises itself as being Islamist Nationalists and are solely focused on fighting the regime. The vast majority of their fighters are Syrian, and not foreign jihadis.

The report also lists Ahrar al-Sham, a salafi group strongest in northern Syria which has ideology similar to ISIS.

Abu Mohammad Golani, leader of Jabhat al-Nusra gave a rare interview to Al Jazeera (pictured) to say the group does not have designs on the west, but the think tank report said they are a threat to British cities