*Club domestic league appearances and goals, correct as of 23:57, 23 November 2024 (UTC) ‡ National team caps and goals, correct as of 19 November 2023
In July 2019, he extended his contract with the club for a further year,[8] before signing a further three-year extension in July 2020.[9] On 19 June 2020, Tella made his senior debut as a substitute in a 3–0 victory against Norwich City.[10] On 11 February 2021, he made his first goal contribution by providing an assist to Stuart Armstrong's goal in a 2–0 FA Cup fifth round win against Wolverhampton Wanderers.[11] On 23 February, Tella made his first Premier League start in a 3–0 defeat to Leeds United.[12] On 15 May, Tella scored his first Premier League goal in a 3–1 win against Fulham.[13]
On 6 January 2022, Tella signed a new three-and-a-half contract with Southampton.[14]
Burnley (loan)
On 11 August 2022, Tella joined Burnley on a season-long loan.[15] On 11 February 2023, he scored a first career hat-trick in a 3–0 victory over Preston North End, his side's tenth consecutive league victory,[16] and a month later scored a second hat-trick in a 3–1 victory over Hull City.[17]
Bayer Leverkusen
On 27 August 2023, Bundesliga club Bayer Leverkusen announced the signing of Tella on a five-year contract,[18][19] for a reported fee of £20 million.[20] He made his first appearance for the club on 2 September 2023 in a 5–1 victory against SV Darmstadt 98, replacing Jeremie Frimpong in the 72nd minute.[21] On 5 October 2023, Tella scored his first goal for Bayer Leverkusen in a 1–2 victory against Molde in the Europa League.[22]