Ngabu made his professional debut on 13 June 2011, scoring a four-round unanimous decision (UD) victory over Jessy Moreaux at Brielpoort in Deinze, Belgium.

[3] After compiling a record of 8–0 (6 KOs) he defeated Christophe Dufaux on 21 June 2014 in Lichtervelde, Belgium, capturing the vacant Belgian cruiserweight title via second-round technical knockout (TKO).

Battelo was forced to withdraw through injury after being involved in a car accident,[8] prompting Mirko Larghetti to step in as a replacement.

[9] He made two successful defences of the title – a third-round TKO against Geoffrey Battelo in January 2018[10] and a UD against Micki Nielsen in February 2019[11] – before facing former British and Commonwealth cruiserweight champion, Lawrence Okolie, on 26 October 2019 at The O2 Arena in London.

[13] His parents emigrated to Belgium from the Democratic Republic of Congo when his father, professional footballer Jean-Pierre Mbemba-Ngabu, was signed by R.S.C.