Mr Capriles alleges that Venezuelan President Nicolas Maduro "stole" April's election through fraud and voter intimidation.
The government says he was instigating unrest against the government of President Nicolas Maduro.
But the electoral authorities said Socialist Nicolas Maduro would be confirmed as the winner.
CARACAS, Venezuela (AP) Nearly half Venezuela's voters don't want Nicolas Maduro in the presidential chair.
On Tuesday, Vice-President Nicolas Maduro said Mr Chavez was in "a complex and delicate post-operative state".
The US government is refusing to recognise Venezuela's President-elect Nicolas Maduro's victory in disputed elections in Venezuela.
BBC: US holds back recognition for Venezuela's Nicolas Maduro
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.
In the absence of President Chavez, Mr Cabello and Vice-President Nicolas Maduro are in effect running the country.
On Tuesday, Vice President Nicolas Maduro stood in for Chavez at the annual state of the union speech.
Nicolas Maduro, the current foreign Minister and the man Chavez appointed as his successor, leads the civilian faction.
CENTERFORSECURITYPOLICY: Some Reflections Over Speculations on Venezuela's Future
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
On the eve of the election, acting President Nicolas Maduro appeared on TV visiting the tomb of Hugo Chavez.
BBC: Venezuela opposition says government broke election law
The sale will wait until April 14 elections, which Chavez's hand-picked successor, Nicolas Maduro, is highly favored to win.
Vice-President Nicolas Maduro and National Assembly Head Diosdado Cabello visited Mr Chavez this week, along with several other dignitaries.
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.
Rival Nicolas Maduro was declared to have won the poll, and earlier said he would not allow the opposition rally.
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).
Venezuelan opposition candidate Henrique Capriles has threatened to take action over disputed votes he claims were "stolen" by Nicolas Maduro's government.
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
The electoral commission in Venezuela has said an audit of last Sunday's disputed presidential vote will not affect Nicolas Maduro's victory.
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).
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It says as the president lay dying, his deputy Nicolas Maduro moved swiftly to copy the anti-American rhetoric of the socialist leader.
Venezuela's foreign minister said Vice President Nicolas Maduro would step in as interim president and elections would be called within 30 days.
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