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*Club domestic league appearances and goals, correct as of 23:01, 30 December 2024 (UTC) ‡ National team caps and goals, correct as of 20:21, 25 March 2024 (UTC)
On 25 September 2019, he made his debut for the London club as a substitute in a 7–1 EFL Cup victory over Grimsby Town.[11]
Loan to Charlton Athletic
On 13 October 2020, Maatsen joined Charlton Athletic on a season-long loan.[12] On 20 October, he made his league debut for Charlton, coming off the bench as a second-half substitute in the side's 1–0 win over Blackpool.[13] He scored his first senior goal on 2 April 2021 in a 1–0 away win over Doncaster Rovers.[14]
Loan to Coventry
On 30 July 2021, Maatsen joined Coventry City on loan.[15] On 2 October 2021, he scored his first goal for Coventry in a match against Fulham, helping his team to a 4–1 victory.[16] Overall, Maatsen made 40 league appearances for the Sky Blues and scored three goals during the 2021–22 season.[17]
Loan to Burnley
On 15 July 2022, Maatsen joined Burnley on a season-long loan.[18] He made his debut in the first round of the 2022–23 EFL Championship against Huddersfield Town, where he also scored the only goal of the game in a 1–0 win.[19] Following his impressive performances, Maatsen was named the EFL Championship Player of the Month for January 2023.[20] His team eventually won the league and promotion to the Premier League,[21] with Maatsen being included in the Championship Team of the Season as the best left-back.[22]
Loan to Borussia Dortmund
On 12 January 2024, Maatsen signed a contract extension with Chelsea until 2026 and joined Borussia Dortmund on a six-month loan.[23] On 16 April, he scored his first Champions League goal in a 4–2 win against Atlético Madrid in the quarter-finals second leg, helping his team progress to the semi-finals.[24] Borussia eventually reached the final, where Maatsen started the match and made a misplaced pass that led to Real Madrid's second goal in a 2–0 defeat at Wembley Stadium.[25][26] However, he was named in the competition's Team of the Season as the best left-back.[27][28]
Aston Villa
On 28 June 2024, Maatsen signed for fellow Premier League club Aston Villa for an undisclosed fee, reported to be £37.5 million, signing a six-year contract.[29][30] On 17 August 2024, Maatsen made his Aston Villa debut as a substitute in a 2–1 opening day victory over West Ham United.[31]
International career
Maatsen is a youth international for the Netherlands, having represented the country at all levels from under-15 to under-21.[32]
In May 2024, Maatsen was selected in the 30-man preliminary squad for UEFA Euro 2024,[34] but was later omitted from the final squad.[35] However, he was re-called to the Netherlands' Euro 2024 squad on 11 June as a replacement for the injured Frenkie de Jong.[36]