"It's my reputation at stake," said Odumbe on the eve of the hearing by the International Cricket Council's (ICC) Anti-Corruption and Security Unit (ACU).
ACU launched a report on the former Kenyan captain following an year-long investigation that he received payments from an Indian bookmaker during his trips to the sub-continent in 2002.
Odumbe, who has played 61 One-day Internationals and three World Cups since making his debut in 1996, has denied any wrong-doing.
But at 34, and at the twilight of his playing days, Odumbe knows the case would be a big setback on his often turbulent career, marked by his outspoken style which led to frequent brushes with Kenyan cricket authorities.
In 1998, he was suspended and fined by the Kenya Cricket Association for criticising the national cricket team selectors and was relieved of the captaincy of the national team in 2002.
Ironically on the first day of the inquiry, Odumbe will be making his debut as a presenter on an education programme featured on the state-owned Kenya Broadcasting Corporation television station.
In the programme, Odumbe will talk about a youth football tournament he organised at his rural home in Kendu Bay in southwest Kenya in December 2003 in honour of his late brother and former international teammate, Martin Orewa.
Odumbe said that the tournament was held to sensitize children on HIV/AIDS, from which Orewa had died.
"I used to go to India often to buy medicine for my sick brother," said Odumbe, whose three other brothers also represented Kenya at the international level.