Uhuru Kenyatta won the presidential election in Kenya in April. Kenyatta bested challenger and former Prime Minister Odinga, whose challenge to election results in 2007 sparked violence that left 1,000 people dead.
Odinga said he was frustrated with the way in which an independent electoral commission handled this year's contest.
"There are a lot of issues with this commission, that's the reason why I said, since the introduction of multiparty politics, this is the most disgraceful commission we've had," he was quoted Wednesday as saying by Kenyan newspaper the Daily Nation.
Odinga had said the vote count was rigged in favor of Kenyatta. International observers, however, described this year's election as generally fair.
Kenyans since the election have expressed concern about the poor state of the national economy. Odinga said it's too early to pass judgment on the Kenyatta administration, barely 100 days into its first term.
"Don't judge them harshly," he said. "A hundred days is a very short time within which to measure the performance of a government."