"The 2017 general election was a fraud".
"We believe that the election has been conducted in a transparent and credible manner and that Kenyans must be commended for that election", he added at a press conference in Kenya's capital, Nairobi.
Mudavadi said the opposition had gotten the information from "confidential" sources inside the election commission.
Some 400 global observers were present for Tuesday's vote, and their team leaders from the African Union, Commonwealth and European Union called for calm and restraint.
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Odinga's comments raised the specter of post-election violence, which blighted Kenya 10 years ago in similar circumstances.
With 95 per cent of polling results declared, Mr Kenyatta had won just over 54 per cent of the vote to nearly 45 per cent for Mr Odinga.
Global observer missions called for calm and restraint as the results were being finalised a day after isolated protests broke out following opposition leader Raila Odinga's rejection of the early tally.
Reuters news agency reports Mr. Odinga claimed most of more than 20,000 polling station result forms uploaded to the election commission's website were fake, doubling down on previous claims of "massive" fraud in Tuesday's presidential election.
His defeat in an election ten years ago triggered the worst violence in independent Kenya's 54-year history, killing more than 1,300 people and forcing 600,000 more to flee their homes.
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The nine accused men, who are all from Central Asia, were charged with 17 murders and 2 attempted murders. In November 2014, the authorities arrested five gang members and killed their leader, an Uzbek citizen.
The riots, in which protesters burned tires and tossed stones and soldiers used tear gas, recall the 2008 crisis when more than 1,000 people died in pitched battles with the police in protests over December 2007 election results.
Election officials were verifying the final tallies Wednesday night.
"We plead for patience as we work through this process", commission CEO Ezra Chiloba said Friday afternoon.
The mission who visited 464 polling stations across the country, said Tuesday vote, "was consistent with policies of the African Union" but voter education was insufficient.
Head of the EU's election mission Marietje Schaake confirmed Kerry's assessment of the voting, and said she had seen "no signs of centralized or localized manipulation". One protester was also shot dead by police in Kisii county. "The results show Raila garnered 8.04 million votes and Uhuru 7.7 million", he said.
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To that end, the State Department has said the launch violated the spirit of the nuclear deal and also flouted a U.N. And last week, the US certified for a second time under Trump that Iran is in compliance.