Algerian President Abdelaziz Bouteflika has submitted official papers confirming that he will seek a fifth term, as thousands have marched across the country to protest the move.
The deadline to register for the April 18 elections ends at midnight Sunday.
The 82-year-old, who uses a wheelchair and has rarely been seen in public since a 2013 stroke, has remained invisible and silent on the demonstrations since they broke out last month. He was at the weekend still in Switzerland for unspecified medical checks, according to Swiss media.
There are no legal requirements for candidates to be physically present to submit their bid to the Constitutional Council although election commission head Abdelwahab Derbal said that each candidate must appear in person by midnight on Sunday if they wish to stand.
Hundreds of students had earlier gathered inside a university campus near the Council, chanting: “No to a fifth term!”
There were also protests in other higher education faculties in Algiers and cities such as Oran in the west of the North African country, a major producer of oil and natural gas.
Bouteflika's announcement in February that he would seek another term despite his failing health has unleashed the angry protests.
On Saturday, he sacked his veteran campaign manager Abdelmalek Sellal, a former prime minister who successfully oversaw Bouteflika's past three re-election bids, state media said, without giving a reason.
Sellal was removed ahead of a deadline of midnight (2300 GMT) Sunday for contenders to register for the presidential race, and replaced as campaign manager by Transport Minister Abdelghani Zaalene.
Bouteflika will call for elections within one year to replace him if is re-elected in elections in April, Zaalane said in televised comments after submitting the official election papers confirming the incumbent
will seek re-election next month.
In the run-up to the deadline six other candidates had registered, including prominent retired general Ali Ghediri, while businessman Rachid Nekkaz, who has cultivated a mass following among young people, said he would follow suit on Sunday afternoon.
An analyst who declined to be identified said Sellal's sacking could be a tactic to calm the growing protest movement against Bouteflika's bid for a fifth term, reported AFP.
An editorial Sunday in El-Mouhajid newspaper, a mouthpiece of the government, suggested that Bouteflika would not pull out of the race under pressure from the street, saying protesters will be "disappointed".
The sacking came after days of protests that have seen Algerians, including lawyers and students, take to the streets of several cities, including Algiers where protests have been banned since 2001.
The first rally against Bouteflika's bid for re-election drew tens of thousands on February 22 with protesters chanting mostly "No fifth mandate".
The scale of the protests has surprised many in Algeria and represents the biggest challenge in years to the authorities.
On Friday tens of thousands of Algerians were back on the streets in the capital, second city Oran and other towns across the North African country.
During the protests in Algiers clashes erupted between police and protesters when some of them tried to march on the Government Palace which houses the prime minister's office.
Riot police fired tear gas at the protesters, used batons to keep them at bay and also threw at them stones which the demonstrators had initially hurled at the offices, AFP reporters said.
According to a police toll, 56 police officers and seven demonstrators were hurt and 45 arrests made in Algiers.
Bouteflika, who has been in power for two decades, gained respect from many for his role in ending a civil war in the 1990s which according to official figures killed nearly 200,000 people.
Officials have warned that the protests risk dragging Algeria into instability, with the prime minister comparing the rallies to those that sparked Syria's war.
Protesters have been mobilized by calls on social media which have resonated with young Algerians, many of whom struggle for employment in a country where half the population is under 30.
Reporters at state radio have complained that their bosses have imposed a blackout on coverage of the protests, and last week journalists also took to the streets to protest against alleged censorship.
