Chad's foreign minister Mahamat Saleh Annadif will replace Tunisia's Mongi Hamdi, who held the position for just a year.

Annadif served as foreign minister from 1997 to 2003, a UN statement said, and has taken part in several peace processes in Africa, including in Niger, the Central African Republic and Sudan.

The 59-year-old diplomat also directed the African Union Mission in Somalia (AMISOM) between 2012 and 2014.

Under Hamdi's watch, Mali concluded a landmark peace deal between the government and a Tuareg-led rebellion which has launched several uprisings since the 1960s.

With more than 1,100 troops and police, the Chadian contingent is the third-largest contributor to the 10,300-strong MINUSMA peacekeeping force, behind Burkina Faso and Bangladesh.

Deployed since July 2013, the UN mission has seen the most casualties since since that in Somalia from 1993 to 1995.

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