N'Galula started his career on the books at Belgium club Anderlecht but joined Manchester United in 2003 as a promising 16 year-old. In 2004 he signed a full professional contract at Old Trafford and was part of the team that won the Manchester Senior Cup.
N'Galula featured in the academy and reserves but failed to break into the first team at Old Trafford and was subsequently released in 2007.
Upon his release he joined Danish side Randers but left after six-months without featuring in the Danish Supa-League.
In 2008 after impressing in a trail for Sparta Rotterdam N'Galula signed a one -year deal.