Odinga also lost the 2007 election, which was followed by violence fueled by ethnic tensions that killed more than 1,000 people.
The Independent Electoral and Boundaries Commission (IEBC) has declared Uhuru Muigai Kenyatta as the duly elected President of the Republic of Kenya.
"We listened to Raila Odinga and those allegations were directed at the IEBC and the IEBC said as far as they have reviewed they have not found such evidence".
"... The integrity of elections are guaranteed by the backup systems that support those elections so given but not admitting that there was a hacking there are backup systems to still guarantee the integrity of the elections", he added.
Many private and public sector workers have continued to stay at home pending the final declaration of the presidential result.
Another opposition leader, Musalia Mudavadi, claims they have found a fictitious polling center where 1,000 people supposedly voted.
The various observer missions monitoring the elections in Kenya on Tuesday called for peace in that country following heightened tensions following the hacking claims.
"The system is set up to do results transmission but we have had concerns raised and we can not as a commission ignore those concerns".
Chiloba says the commission chairman, Wafula Chebukati, will make an announcement later in the day.
Odinga's claims of rigging after defeat in the 2007 elections prompted rioting and retaliation by security forces, which tipped the country into its worst crisis for decades.
The U.S. ambassador to Kenya says the work of election officials should be not be disrupted as they tally final results in the country's disputed presidential election.More news: Hundred-year-old fruitcake found in 'excellent condition' among Antarctic artefacts
Kenyan voters were given six ballot papers at their polling stations to vote for a president, MPs, Senators, Governors, female representatives and county assembly members. The constitution gives the electoral commission seven days to announce results; in 2022, it may be wise to resist the pressure for news and declare only those results which can be backed up by a publically available, online copy of form 34A.
"Violence must never be an option".
Kenyans went to the polls on August 8 in a peaceful election that had eight presidential candidates. Kenya dropped six places in Transparency International's Corruption Perceptions Index previous year, putting it among 30 countries seen as the world's most corrupt.
But what makes one a "gracious loser" is when he or she accepts the decision of the people to "choose someone over you", the former Ghanaian leader admonished Kenyan politicians while addressing the media in that country, Thursday.
Confrontations between police and protesters in Nairobi and the western city of Kisumu have been reported and they have drawn concern from human rights activists.
Odinga, a former prime minister who has run unsuccessfully for president three times before, said hackers infiltrated the commission's computer system and manipulated results against him. Most of the country has remained calm.
Two people were shot dead in the capital Nairobi on Wednesday, said the city's police chief Japheth Koome, claiming they took advantage of the protests to steal.
Many Kenyans have left Nairobi in recent days, bracing for violence.
President Kenyatta has already taken the lead with 55 per cent of the votes, while Mr. Odinga has 44 per cent.
Businesses have been closed in the central business district since the vote.
Just like in 2013, Kenyatta of the governing Jubilee Party once again beat rival Odinga, who this time contested as the leader of an opposition coalition, National Super Alliance (NASA) that voiced strong criticism over the way the ballots were collated following voting.