He died of a heart attack, having undergone brain surgery earlier this month.
KCB FC released Gabriel Mugabo mid this year as the club started a restructuring process.
Eto’o’s car was hit by a public transport vehicle on the Nkongsamba-Douala road.
It has not given details on the numbers of tickets sold in Japan.
The world record cements the Ugandan 24-year-old's standing as the new middle distance maestro.