The United Arab Emirates' top diplomat warned today that the Islamic State group could team up with Islamic militants in Somalia, saying that more should be done to prepare for such a threat.

The Islamic State group that now controls large parts of Iraq and Syria also known by the Arabic acronym Daesh and the Somali militant Islamic group al-Shabab share a common pedigree in that they both have had links to al-Qaida. They frequently use similar tactics such as explosives-laden cars, suicide bombers and attacks on civilians.

They operate independently for now, but the Emirati foreign minister, Sheik Abdullah bin Zayed Al Nahyan, suggested that could change.

"What really scares us now is what we see from Daesh, and are we going to see in the future any sort of collaboration between different terrorist groups like Daesh and al-Shabab?" Sheik Abdullah said in an address at the opening of a conference focused on counter-piracy in Somalia.

"I think we should start to ask ourselves: how ready we are as countries, companies and international organisations in facing these big threats," he added.

Sheik Abdullah did not cite any specific intelligence pointing to active collaboration between the groups, but there has been speculation that the Somali rebels would shift their allegiance from al-Qaida to the Islamic State group.

The Emirates is a Western-allied, seven-state federation that includes the Gulf shipping and commercial hub of Dubai and the oil-rich capital, Abu Dhabi. It is home to a sizable Somali expatriate population and is among the most prominent Arab allies taking part in US-led airstrikes against the Islamic State group.

Al-Shabab last month named a new leader, Ahmad Umar, and reaffirmed its alignment with al-Qaida after its longtime head, Ahmed Abdi Godane, was killed in a US airstrike 170 kilometres south of the Somali capital of Mogadishu.

The Islamic State group itself began as an Iraqi affiliate of al-Qaida, but it was kicked out of the terror network earlier this year.