Archange joined the Chelsea Academy at the age of 10 and has been used in both midfield and defensive positions while progressing through the ranks at the club.
In the 2010-11 Archange started being picked for reserve team matches, and scored his first goal away at Manchester United in April 2011.
Another high point for Nkumu was that he started in the second leg of the 2011-12 FA Youth Cup final, which Chelsea went on and won.
[3] On 23 October 2012, Nkumu signed on loan for Colchester United until 14 January 2013, but returned a month early, on 1 December 2012.
[4] At the end of April 2019, Nkumu joined Þróttur Reykjavík after a short period at the English club Haringey Borough.