Another top opposition official, James Orengo, said the coalition would not be taking its issues to court, raising the spectre of street protests.
One of the leaders of the opposition Nasa alliance, Musalia Mudavadi, said before the results announcement that its concerns about the poll had not been adequately addressed. Information technology experts for the opposition claimed Wednesday that Msando's user ID and password had been used to hack into the IEBC computer system and to gain access to Chebukati's account starting at about 12.37 a.m.
Around 1,200 people were killed and hundred thousands were displaced after political protests lead to ethnic killings.
The head of the European Union delegation, Marietje Schaake, said her team had seen no signs of "centralised or localised manipulation" of the voting process but that there were concerns about the misuse of public funds at local and national levels by all parties.
"The world is also waiting anxiously to see that peace continues to prevail after the formal declaration of the election result". I'm a Kenyan. I went out and voted peacefully. Results could be announced within hours, though the election commission has until Tuesday to do it.
Many Kenyans say the potential for violence is less now because the country has learned from the traumatic experience of 2007.
Odinga contested and lost Kenya's last two elections, which he also said were rigged.
Orengo said they would not seek redress through legal channels again, saying they had tried once and failed.
At least three people have died in the violence. A few miles from Kibera, there are Land Rover dealerships and new glass high rise towers, but the slum remains crime-ridden and poor, much of it without plumbing or electricity.
According to official figures released by the country's electoral commission on Friday, the incumbent secured 54.27 percent of the ballots cast, while his rival, Raila Odinga, won 44.74 percent.
"Hacking was attempted but did not succeed, that is our position", said Chebukati.
Many private and public sector workers have continued to stay at home pending the final declaration of the presidential result.
Kenyans are expecting to hear the final results today of Tuesday's already disputed presidential election.
NASA has claimed that the results were manipulated in a massive hacking attack, while also saying it has obtained results that are being concealed on IEBC servers that indicate Odinga is the rightful victor.
"I reach out to you, I reach out to all your supporters", Kenyatta said in comments directed to opposition leader Raila Odinga.
"We committed ourselves to ensure these elections were conducted in a free and fair manner", said Chebukati at the event which was boycotted by the opposition.
Violence broke out this week in some opposition strongholds in parts of the capital, Nairobi, and elsewhere. But it has been battered by terrorist attacks, including one on an upscale Nairobi mall that killed 48 people in 2013, and another in 2015 at a northern university, which left 148 dead.
The election is a test of democracy in the East African economic power.
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