After his former France U21 teammate Blaise Matuidi signed for Paris Saint-Germain, N'Goyi went on loan to Ligue 2 side Nantes for the 2011–12 season.

He revealed after the signing of Matuidi that he joined Nantes as he wanted to be playing regular football at this stage of his career rather than being a backup player at Paris Saint-Germain.

On 28 June 2012, he signed a three-year contract with Troyes AC, newly promoted to Ligue 1, on a free transfer from Paris Saint-Germain.

On 26 January 2015, N'Goyi joined Leeds United on loan until the end of the 2014–15 season, with the option for the club to complete a £2 million permanent deal.

[10][11][12][13] In October 2008, N'Goyi was called up to represent DR Congo, along with Paris Saint-Germain teammates Larrys Mabiala and Youssouf Mulumbu, for the 2010 FIFA World Cup qualifier against rivals Malawi.

[14][15] He accepted the call-up but did not make his debut, as his team was surprisingly beaten 2–1 by Malawi, having taken an early 1–0 lead, through former Portsmouth and Newcastle United striker Lomana LuaLua.

[17] On 13 November 2013, N'Goyi got another call-up to the DR Congo squad, but after discussions with manager Claude Le Roy to represent them, he and Stoke City midfielder Steven Nzonzi both turned down the opportunity to play for them.