The commission said Kenyatta won Tuesday's election with 54 percent of the vote. But a coalition of opposition parties says it has evidence of irregularities during the vote count and maintains that Odinga is the rightful victor.
Kenya's opposition said earlier on Friday that it would "not be a party" to the commission's election announcement because its concerns about the election had not yet been addressed.
There's no secret about that.' Mr Odinga was speaking for the first time since President Kenyatta was declared the victor by 1.4 million votes and following calls from the global community for him to calm his supporters.
Following the announcement of the the Presidential Election in Kenya by the Electoral body which declared incumbent President Uhuru Kenyatta as the victor, violent protests have broken out at the stronghold of his opponent, Raila Odinga.
"I extend a hand of friendship, I extend a hand of cooperation, I extend a hand of partnership, knowing full well that this country needs us, all together". "And Kenyans want us to succeed", said Kenyatta, who was flanked by his Deputy William Ruto.
Police fired gun shots and tear gas in the slums of Kenya's capital city, Nairobi, and in Kisumu, a city in Kenya's west, during protests that stemmed from the elections results.More news: Pakistan's Sharif sets off on 'homecoming' procession
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According to Kenyan human rights watchdog, at least 26 people have been killed in the post-election violence, while oppostion leaders claim the death toll is much higher.
The announcement came as Kenya's defeated opposition faced mounting calls at home and overseas to calm their supporters after claims of election-rigging sparked violent protests that left at least 16 people dead.
"We have seen the results of political violence".
Chebukati said, "I, therefore, wish to declare honourable Uhuru Kenyatta as the President-Elect and honourable William Ruto as the Deputy President-Elect".
Opposition official James Orengo later called the election process a "disaster".
On August 11, Kenya's incumbent President Mr Kenyatta was declared the victor of the country's Presidential election.