VfL Bochum In July 2018, Bella-Kotchap joined
VfL Bochum professional team
2018–19 summer training camp. In March 2019, Bella-Kotchap signed his first professional contract with VfL Bochum. He made his professional debut for Bochum in the
2. Bundesliga on 28 April 2019, starting in the away match against
Erzgebirge Aue.
Southampton On 21 June 2022, Bella-Kotchap joined
Southampton on a four-year deal, for a fee estimated at 10 million euros. Having established himself as a regular starter at centre-back, He returned from injury on 6 November in a 4–1 home defeat against
Newcastle United. On 4 January 2023, Bella-Kotchap tweaked his knee during the first half of a 1–0 home defeat against
Nottingham Forest and was expected to be injured for a matter of weeks. Bella-Kotchap dislocated his shoulder again during a 3–3 draw with
Tottenham Hotspur on 18 March 2023.
PSV (loan) On 1 September 2023, Bella-Kotchap joined
Eredivisie side
PSV on a season-long loan. He made his professional debut for the club on 16 September 2023 in a 4–0 victory against
NEC. Four days later, Bella-Kotchap made his first
Champions League appearance in a 4–0 defeat to
Arsenal. In October 2023, he suffered a shoulder injury and was expected to be sidelined until the end of year.
Hellas Verona On 27 August 2025, Bella-Kotchap joined
Serie A side
Hellas Verona on a season-long loan. He made his debut for the club on 31 August in a 4–0 defeat against
Lazio after he replaced
Fallou Cham in the 46th minute. On 2 February 2026, Bella-Kotchap joined the club permanently for an undisclosed fee. ==International career==