Part of Belgium's successful qualification campaign for EuroBasket 2015, Tumba had 16 caps in total entering this summer, after landing his senior debut in a friendly against the Netherlands in July 2014. He previously represented the country at U20 level (2011). The defensive specialist started his career in the junior teams of Mons-Hainaut before moving to Leuven, leading the Belgian league in blocks in 2014. He joined Charleroi in April. Tumba was born in the Democratic Republic of Congo.