Early career Ben Slimane was born in
Copenhagen and lived in the
Vesterbro neighbourhood during his youth. He started playing for the lower levels of Vesterbro club BK Vestia at age 7, which was the club located most closely to his home. Ben Slimane was twelve years old when he moved to Brøndby. He played for their academy teams for one and a half years before moving back to play for
KB at the under-13 level because of excessive travelling time to Brøndby after he and his family had moved to
Høje Gladsaxe. During one summer, where he played in AB's youth academy, he experienced a large
growth spurt in which he grew 15 cm, which enabled him to become more dominant physically and helped him develop as a player. He made his first-team debut for AB on 7 April 2018 in a 2–1 home win over
IF Lyseng, coming on as an 80th-minute substitute for
Nichlas Rohde. Slimane made a total of 18 league appearances for AB in which he scored two goals. In January 2020, he was selected to participate in Brøndby's first-team training camp in Portugal, where he made his first appearance for the senior side in a
pre-season friendly against Swedish side
IFK Norrköping, impressing in front of scouts from
Arsenal and
Manchester United. On 16 February 2020, Ben Slimane made his professional debut in an away match against
OB in the
Danish Superliga as a starter, which Brøndby won 2–0. The following week, he made his first assist, a cross into the box which
Samuel Mráz slotted home in a 3–2 loss to
AaB. On 8 March 2020, he scored his first goal for Brøndby in a 2–2 draw away against
FC Nordsjælland; a match played
behind closed doors at
Right to Dream Park due to guidelines implemented by Danish authorities during the
COVID-19 pandemic. After the match, Ben Slimane expressed his regret in not being able to celebrate his goal in front of fans.
2020–21: Danish Superliga champions On 3 July 2020, Ben Slimane signed a new contract with Brøndby, keeping him at the club until 2024. After struggling to find his way to the starting lineup during the first half of the
2020–21 season, he scored the winning goal on 13 December against
SønderjyskE after coming on as a substitute for
Simon Hedlund in the 77th minute. On 1 February 2021, Ben Slimane was fined and temporarily withdrawn from the Brøndby squad after breaking coronavirus quarantine guidelines. According to him, he picked up a female friend at a party, and the police showed up. He subsequently tested negative for COVID-19 twice and was included in the first team again on 3 February. He made his return to the pitch on 7 February as a starter in a 1–1 home draw against AaB. On 24 May, Ben Slimane scored Brøndby's second goal in their 2–0 win over Nordsjælland. The result confirmed Brøndby as Danish Superliga champions for the first time in 16 years. He scored his first goal of the season on 29 August as Brøndby beat Midtjylland 2–0 – their first win of the season.
Sheffield United On 13 July 2023, Ben Slimane signed for recently promoted
Premier League club
Sheffield United on a three-year contract, taking the number 25 jersey. It was reported that the club had triggered his release clause which saw them pay under £1 million up front, with performance-related add-ons potentially increasing the transfer fee. On 12 August, he made his competitive debut for the Blades in a 1–0 league loss against
Crystal Palace. He made 15 league appearances during the season as the club was relegated back to the
EFL Championship after one year in the top flight. Ben Slimane scored his first goal for Sheffield United on 13 August 2024 in an
EFL Cup tie against
Wrexham.
Norwich City On 30 August 2024, Ben Slimane signed with
EFL Championship club
Norwich City on a season-long loan, with an option to make the move permanent upon the completion of certain criteria. The following day, he made his competitive debut for the Canaries, replacing
Forson Amankwah at half-time in a 1–0 league win away over
Coventry City. He scored his first goal for the club on 26 November in a dominant 6–1 league victory over
Plymouth Argyle, managed by
Wayne Rooney. On 14 January 2025, Norwich City activated a clause in Ben Slimane's loan agreement, making his move from
Sheffield United permanent for an undisclosed fee. He signed a long-term contract after contributing two goals in 21 league appearances during his loan spell. ==International career==