Arthur Masuaku

Valenciennes

Masuaku came through the youth system of Valenciennes. He made his Ligue 1 debut on the opening game of the 2013–14 season on 10 August 2013 against Toulouse. He was substituted after 75 minutes for Tongo Doumbia. On 29 January 2014 Masuaku scored his first competitive goal for Valenciennes in a 2–1 away defeat against Marseille.

Olympiacos

In July 2014, Masuaku signed for Olympiacos. He made his Super League debut against Niki Volos, and in his third league match he provided two assists against OFI in a 3–0 home win. Three days later he made his debut and scored in the UEFA Champions League competition against Atlético Madrid in a 3–2 home win. In April and May 2015, interest from Roma, Internazionale and Juventus was reported. His agent, Roger Henrotay, however stated a renewal of Masuaku's contract was on the cards. In July, a reported €4 million offer for Masuaku including former Olympiacos midfielder Giannis Fetfatzidis from Genoa was rejected by the club.

West Ham United

On 8 August 2016, Masuaku joined West Ham United on a four-year contract for a £6.2 million fee. He made his West Ham debut in a 2–1 away defeat to Chelsea on 15 August 2016. Masuaku admitted that he found his Premier League debut very tough due to the pace and physicality of the league. He scored his first goal for West Ham in an EFL Cup tie against Bolton Wanderers on 19 September 2017. In the FA Cup fourth round game against Wigan Athletic on 27 January…

Having represented France at under-18 and under-19 level, Masuaku switched his allegiance to DR Congo in June 2017. In August 2017, he was called into his first DR Congo squad, for two 2018 World Cup qualification games against Tunisia. In March 2018, still yet to make his international debut, Masuaku travelled with the DR Congo squad for a friendly against Tanzania. He was one of four players to drop out before the game, amidst claims of organisational problems and travel disorder, and did not appear. 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. Masuaku scored his first goal for DR Congo, a free-kick, in a 1–1 away draw with Kenya on 15 June 2019. On 27 December 2023, Masuaku was included in the final 24-man squad for the 2023 Africa Cup of Nations. He started his nation's first match at the tournament, a 1–1 draw with Zambia on 17 January 2024. He went on to score in his nation's 3–1 victory over Guinea in the quarter-finals on 2 February 2024. It booked DR Congo a place in the semi-finals of the AFCON for the first time since 2015. On May 19, 2026, he was included in the 26-man squad selected by head coach Sébastien Desabre to represent the DR Congo at the 2026 FIFA World Cup.

Masuaku was born in Lille, France, to DR Congolese parents. He acquired French nationality on 20 April 2006, through the collective effect of his mother's naturalization.

Masuaku is a practising Muslim. In June 2025, he made the Umrah pilgrimage to Mecca.