He joined German club Schalke 04 in January 2019, where he made 32 first-team appearances and was sent on loan to Stoke City and Cercle Brugge.

[13] On 7 January 2021, Matondo joined EFL Championship club Stoke City on a loan deal until the end of the 2020–21 season.

[16] On 9 August 2021, Matondo agreed to join Cercle Brugge on a season-long loan with an option to make the move permanent.

[18][19] He made his debut for the club against Belgian side Union Saint-Gilloise during a UEFA Champions League qualifier loss on 2 August.

[21] Matondo scored his first UEFA Champions League goal in a 1st leg Qualifier on 22 August 2023 vs PSV Eindhoven slotting home a first-time finish into the bottom corner after a counter-attack to equalise.

[23] Matondo scored 34 minutes into his debut against Hamburg SV, receiving the ball on the left wing, and jinking between two defenders before curling into the far right corner.

[27] After appearing in four qualifying matches as a substitute,[27] he made his first start for the under-21 side in a 1–1 draw with Georgia in the second of two friendlies against the nation in June 2018.

[31] In May 2019, after travelling back to England from a Welsh national team training camp in Portugal, Matondo was escorted from the plane by police after "behaving disruptively".