[8][9] He made his Superleague debut against Niki Volos, and in his third league match he provided two assists against OFI Crete in a 3–0 home win.

[10] Three days later he made his debut and scored in the UEFA Champions League competition against Atlético Madrid in a 3–2 home win.

[14] In July, a reported €4 million offer for Masuaku including former Olympiacos midfielder Giannis Fetfatzidis from Genoa was rejected by the club.

[15] On 8 August 2016, Masuaku joined West Ham United on a four-year contract for a £6.2 million fee.

[23] On 4 December 2021, Masuaku scored the winning goal in a 3–2 victory over defending UEFA Champions League winners Chelsea.

[24][25] On 2 August 2022, Masuaku joined Turkish team Beşiktaş on a season long loan with an option to buy in 2023.

[31] In March 2018, still yet to make his international debut, Masuaku travelled with the DR Congo squad for a friendly against Tanzania.

[32] He made his debut on 13 October 2018, starting in a 1–2 home loss against Zimbabwe in a 2019 Africa Cup of Nations qualification game.