 He retired at the age of 38, but remained with his main club as its assistant manager and helped it return to the second level for the 2009–10 campaign.Kasongo made his debut for the Zaire national team in 1992, and played for them during a full decade.He represented his country at the 2000 Africa Cup of Nations held in Ghana and Nigeria, at which the country reached the group stage, conceding only once in three matches but failing to score.