"Of course, I am no longer the same physical force as before -- something that I have never hidden from the people," said Bouteflika, according to the APS news agency, as he apparently broke his silence on his intentions for the April 18 poll.
"But the unwavering desire to serve... has never left me and it allows me to transcend the constraints linked to health troubles which everyone may one day face," the president reportedly added.
Known for wearing a three-piece suit even in the stifling heat, Bouteflika gained respect from many for his role in ending Algeria's decade-long civil war, which official figures say killed nearly 200,000 people.
But the country's hydrocarbon-dependent economy was hit hard by a drop in crude prices during the president's fourth term, and now nearly a third of Algerians under 25 are unemployed.
Bouteflika has also faced criticism from rights groups and opponents who accuse him of being authoritarian.
If re-elected, he would set up an "inclusive national conference" to address "political, economic and social" issues and "propose an enrichment of the constitution", APS reported.
This conference would be mandated to establish "a consensus on reforms and changes" in Algeria, the president's message said, but added that he would be the one to act on conclusions.
"A stronger presence of young people" inside political institutions, economic reform and a scaling back of bureaucratic red tape would be among the topics to be discussed at the conference.
The president has come up with "a strong and new plan" involving economic and political reforms to enact for the benefit of Algerians, Sellal told private TV network Ennahar.
The country's four-party ruling coalition -- which includes the president's National Liberation Front (FLN) -- backed Bouteflika earlier this month.
His continued backing by the establishment makes him a firm favourite. Retired general Ali Ghediri, 64, was the first to announce his candidacy after the presidency set the election date.
Algeria's main Islamist party, the Movement for the Society of Peace, will also take part, backing its candidate Abderrazak Makri.
It has said Bouteflika would be unable to handle the demands of another term in office because of his poor health.
The country's oldest opposition party, the Front of Socialist Forces, announced last month that it would not field a candidate and called for an "active, intensive and peaceful boycott".
In early 2016, he dissolved the all-powerful DRS intelligence agency after dismissing its leader General Mohamed Mediene, known as "Toufik", who had clung to the post for a quarter of a century.
Presidential candidates have until March 3 at midnight (2300 GMT) to submit their applications.
For the last presidential election in 2014, Bouteflika had only declared his intention to run a few days ahead of the deadline.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)