Ivory Coast's President Alassane Ouattara has secured a fourth term in an election which two of his biggest challengers were barred from, provisional results show.

Ouattara, 83, won 89.8% of the vote, the electoral commission revealed on Monday, with businessman Jeal-Louis Billon trailing far behind at just 3.09%.

The overwhelming victory was anticipated, particularly after former President Laurent Gbagbo and ex-Credit Suisse CEO Tidjane Thiam urged their followers to boycott the vote following their disqualification from the race.

Voter turnout was reported at 50.1%, according to the electoral authority.

Simone Gbagbo, Laurent Gbagbo's former wife who was allowed to contest the election, received 2.42% of the vote.

While the election results are provisional, the official outcome will be finalized by the Constitutional Council after addressing any challenges or petitions concerning the election.

On the day of the presidential election, an opposition coalition denounced the election as a 'civilian coup d'etat,' expressing their refusal to recognize Ouattara's legitimacy as the elected president.

Ouattara first took office in 2011, following Gbagbo's incarceration after his refusal to concede defeat in the 2010 election. Originally limited to two terms, a constitutional change in 2016 enabled Ouattara to run for re-election in 2020, an election that was boycotted by opposition parties.