Mali's constitution requires that the swearing-in ceremony takes place two weeks after official results are released.
Keita won Mali's Aug. 11 presidential runoff with 77.6 percent of the vote. His opponent, Soumaila Cisse, conceded defeat even before those results were announced.
Many voters said they thought Keita was best equipped from an initial field of 28 candidates to reunite the nation after more than a year of turmoil. Once he names his government, though, he will have only two months to resume talks with the northern Tuareg rebel group known as the National Movement for the Liberation of the Azawad, the name they call their homeland.
In addition to the simmering rebellion in the north, Keita also faces the tasks of tackling corruption and ethnic tensions, and rebuilding the country's economy.
And even as he tries to move past Mali's coup era, there are lingering ghosts: The coup leader Amadou Sanogo was recently promoted from captain to four-star general, making him the highest-ranking military official even after the recent democratic election.
"After a deeply troubling period, Mali stands at a crossroads," said Corinne Dufka, senior West Africa researcher at Human Rights Watch. "President Keita's actions or inactions could usher in greater respect for human rights or a return to the problems that caused Mali's near-collapse last year."