He reportedly died in Belgium at the age of 48 after going to the hospital to be examined on Thursday.
According to the Nation, Osondu felt unwell at work and decided to visit the hospital where he passed on.
Osondu played regularly for the youth teams of Nigeria, but never reached the first team.
In 1987 he participated in the World U-16 tournament in Canada where Nigeria reached the final, but lost on penalties to the Soviet Union.
Osondu received the World Cup Golden Ball as best player of the tournament.