His absence from the public for more than six weeks last year led to speculation about his well-being and unfounded rumours that he had died.

His candidacy was expected but not formally confirmed until Sunday's social media post.

Biya has never lost an election since taking power in 1982 and if he wins another seven-year term he could be president until he is nearly 100.

There have been growing calls from inside and outside Cameroon for him to step aside and give way for fresh leadership in the central African nation.

His candidacy follows a recent political divorce from key allies from the northern regions, who had been crucial in helping secure votes in previous elections from that part of the country.

Two of these men - prominent minister Issa Tchiroma Bakary and former Prime Minister Bello Bouba Maigari - recently quit the ruling coalition and separately announced plans to run in the election.

Last month, Tchiroma said the Biya administration he belonged to had "broken" public trust and he was switching to a rival party.

Multiple opposition figures, including 2018 runner-up Maurice Kamto, as well as Joshua Osih, Akere Muna, and Cabral Libii, have also announced their candidacies.

However, members of the governing Cameroon People's Democratic Movement and other supporters have since last year publicly called for Biya to seek another term. He was already the de-facto candidate as the party leader.

Biya abolished term limits in 2008, enabling him to seek the presidency indefinitely.

He won the 2018 elections with more than 71% of the vote although opposition groups accused the process of widespread irregularities.