He was sworn in during a ceremony held in the capital Bamako today, September 25, 2020.
The ceremony occurred with government officials dressed in military attires while senior judges, and foreign diplomats were also present.
Ndaw alongside Colonel Assimi Goita, who led the military junta, will now transitionally lead for a maximum of 18 months before organising national elections.
During the ceremony, Supreme Court Chief Prosecutor Boya Dembele said the challenges facing both men were “enormous”.
“It will truly require a reformulation of the state,” said the judge, dressed in red fur-lined robes.
The 15-nation Economic Community of West African States (ECOWAS) slapped sanctions on the poor country on August 20 after the coup but following the new interim government.
ECOWAS might reduce the sanctions according to former Nigerian president and ECOWAS mediator Goodluck Jonathan.
Last month’s coup followed weeks of mass protests against Keita.
There has also been increased jihadist activity and high levels of corruption in the country.