Presidential candidate Raila Odinga has said he will contest his challenger Uhuru Kenyatta's win in court.
Mr Odinga pointed to problems in tallying the votes and urged his supporters to remain calm as he seeks relief from the Supreme Court.
"Raila has no intention of conceding and will be challenging this in court," Mr Odinga's advisor Salim Lone told the Nation.
"The level of the failures in the system makes it very difficult to believe it was a credible result, and if Uhuru is declared president, Raila will go to court."
Mr Lone said that Mr Odinga would "very strongly ask people to stay calm" and wait for the courts to address his complaints.
Mr Kenyatta garnered 6,173,433 votes out of 12,338,667 total votes cast in the March 4 General Election. This translates to 50.03 of the vote.
Mr Odinga came second after polling 5,340,546 which represents 43.28 per cent of the vote.