Nancy Born in
Douala, Cameroon, Amadou moved to France at age 4 and lived in
Colombes, where he played at local club AS Cheminots de l'Ouest. He then spent four years at
Racing Club de France, before joining the
Nancy academy in 2008. Amadou made his professional debut on 26 May 2013, playing one minute in the last matchday of the
Ligue 1 season against
Stade Brestois. On 8 August 2014, he scored his first goal against
Orléans in
Ligue 2.
Lille On 16 July 2015, Amadou signed a four-year contract with
Lille for a reported fee of €2 million. He started in the first match of the
2015–16 Ligue 1 season against
Paris Saint-Germain on 7 August 2015, playing in the heart of defense alongside
Renato Civelli as Lille suffered a 1–0 defeat. He scored his first goal for the club in the 2–1 win over
Bastia on 12 March 2016. At the start of the
2017–18 season, manager
Marcelo Bielsa appointed Amadou as club captain. On 13 August 2017, he took over the goalkeeping role in the 3–0 loss to
Strasbourg, following the sending off of
Mike Maignan.
Sevilla On 2 July 2018, Amadou joined Spanish
La Liga side
Sevilla on a four-year deal. On 7 August 2019, Amadou joined
Norwich City on a season-long loan, with an option to buy the following summer. On 31 January 2020, Amadou's loan to Norwich was terminated, and he joined
Leganés until the end of the season. On 5 October 2020, Amadou joined French club
Angers on loan. On 12 January 2022, he mutually terminated his contract with Sevilla.
Metz On 13 January 2022, Amadou signed for French club
Metz on a contract until the end of the
2021–22 season. An option for a further two seasons was included in the deal.
Return to Angers On 1 September 2022, Amadou returned to Angers on a one-year contract. On 18 March 2023, he mutually terminated his contract with Angers.
Shanghai Shenhua On 30 March 2023, Amadou joined
Chinese Super League club
Shanghai Shenhua.
Chongqing Tonglianglong On 6 February 2026, Amadou left
Shanghai Shenhua and joined another
Chinese Super League club
Chongqing Tonglianglong as free agent. ==International career==