[6][citation needed] After representing Zambia at the 2007 FIFA U-20 World Cup, the 19-year-old was invited for trials at the English side Reading.

[7] The Championship side was keen on securing him on a longer deal but due to work permit problems the move did not materialise.

[7] He signed a loan contract for Châteauroux in September 2008 and after the end of the season on 30 June 2009 returned to Zanaco FC.

[citation needed] His registration to Zanaco was a loan from Afrisports and there was some initial dispute regarding his move to TP Mazembe but it was eventually resolved.

Moses Katumbi, president of TP Mazembe, accused Sunzu's handlers of lying to Reading about his contract stating that it does not expire until 2015.

[22] On 3 February 2017, Sunzu signed a loan deal with the Russian Premier League club FC Arsenal Tula until the end of the 2016–17 season.

[29] In the 2019–20 winter transfer period, Sunzu left Metz to join Chinese Super League side Shijiazhuang Ever Bright.

[31] On 29 February 2024, Sunzu rejoined Chinese Super League club Cangzhou Mighty Lions (previous name of Shijiazhuang Ever Bright).