But the electoral authorities said Socialist Nicolas Maduro would be confirmed as the winner.
On Tuesday, Vice-President Nicolas Maduro said Mr Chavez was in "a complex and delicate post-operative state".
Venezuelan President Hugo Chavez is "battling for his health, for his life", his deputy Nicolas Maduro says.
His comments came a day after Vice-President Nicolas Maduro said Mr Chavez had finished "the post-operative period".
BBC: Hugo Chavez joking and laughing, says Venezuela minister
Officials have planned a "beautiful event" in honor of Chavez, Venezuelan Vice President Nicolas Maduro said Wednesday.
Mr Lula da Silva, however, recently released a video expressing his support for Mr Capriles' opponent, Nicolas Maduro.
Opinion polls say the government's candidate - acting President Nicolas Maduro - has a strong lead over his rival.
BBC: Venezuela election: Capriles supporters in Caracas march
Venezuelan President Hugo Chavez, re-elected on Sunday for another six-year term, has named Nicolas Maduro as his new vice-president.
On Sunday, Venezuelan Vice President Nicolas Maduro said "new complications" had surged as a result of the infection.
Meanwhile, Wednesday night, Vice President Nicolas Maduro headed up a Cabinet meeting and welcomed a group of regional foreign ministers.
The latest expulsions came as Vice President Nicolas Maduro and challenger Henrique Capriles registered as candidates to succeed Mr Chavez.
Vice-President Nicolas Maduro - who is acting as president - will be the candidate for the governing socialist party (PSUV).
Vice-President Nicolas Maduro, who was named by Mr Chavez as his preferred successor, has been highly visible since the president's death.
BBC: Venezuelan parties gear up for polls after Chavez death
On the day Mr Chavez died, the Vice-President Nicolas Maduro also likened his case to the death of the Palestinian leader.
Nicolas Maduro will be the candidate of the PSUV while Henrique Capriles Radonski will be the candidate of the united opposition (MDU).
CENTERFORSECURITYPOLICY: Could the papacy play a role in post-Chavez Latin America?
Venezuela's foreign minister said Vice President Nicolas Maduro would step in as interim president and elections would be called within 30 days.
Vice-president Nicolas Maduro went to Cuba on Saturday to meet Mr Chavez.
Venezuelan opposition candidate Henrique Capriles has vowed to challenge President Nicolas Maduro's narrow victory in the 14 April presidential poll in the Supreme Court.
BBC: Venezuela's Henrique Capriles to challenge vote in court
The acting president of Venezuela, Nicolas Maduro has said it is highly unlikely that the body of the former president Hugo Chavez will be embalmed.
Vice-President Nicolas Maduro said there would be a thorough investigation into the riot, led by Venezuela's Prosecutor General and the President of the National Assembly.
Mr Chavez's handpicked candidate Nicolas Maduro is seen as the front-runner, but recent polls said the gap between him and his rival, Mr Capriles, was narrowing.
BBC: Venezuela opposition says government broke election law
This fire-fighting approach continued even as Mr Chavez lingered on his Cuban sickbed, with Vice-President Nicolas Maduro implementing a 32% devaluation of the bolivar in February.
Shortly before making his most recent journey to Havana, Mr Chavez suggested that his supporters should consider naming his Vice President, Nicolas Maduro, as his successor.
Local media quoted Vice-President Nicolas Maduro as saying that Mr Chavez landed at 02:30 local time (06:30 GMT) before being transferred to the Military Hospital in Caracas.
BBC: Hugo Chavez returns to Venezuela after Cuba cancer care
In May 2012, Mr Chavez said he had recovered from an unspecified cancer, but in December underwent further surgery and named his vice-president, Nicolas Maduro, as his choice as successor.
The announcement comes hours ahead of President-elect Nicolas Maduro's inauguration.
Senior leaders including Vice-President Nicolas Maduro, the head of the National Assembly Diosdado Cabello, and Oil Minister Rafael Ramirez have been travelling to and from Cuba in recent weeks.
He also called on Vice-President Nicolas Maduro, who under the court ruling will continue to govern during Mr Chavez's absence, to "start solving the problems besetting the Venezuelan people".
Venezuelan President Hugo Chavez died Tuesday at the age of 58, according to an announcement on state-run television by Vice President Nicolas Maduro. ( See the official announcement here).
Vice President Nicolas Maduro, the interim president, has made no mention of running for election, but he is widely expected to be the United Socialist Party of Venezuela's candidate for the job.
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