 Born in Kinshasa, Kasongo played in his country for Lubumbashi Sport and Daring Club Motema Pembe.In 1996, he moved to Portugal where he was to spend 12 years as a player, starting at S.C. Covilhã in the Liga de Honra then signing with Vitória de Guimarães from the Primeira Liga in the following season, being relatively used during over two years.Kasongo joined G.D. Chaves in the 1999 summer, and played there until his retirement, collecting almost 300 official appearances and competing exclusively in the second tier apart from 2007–08, which was his last year.