In the following campaign, Iling-Junior started with Juventus Next Gen,[α] scoring four goals in seven matches, and then was promoted to the first team in December 2022, after making his debut both in Serie A and Champions League.

[9] In 2020, he decided to leave Chelsea, rejecting an athletic scholarship deal,[10] attracting interest from clubs such as Paris Saint-Germain, Bayern Munich, Borussia Dortmund and Juventus; he signed a three-year contract with the latter in September of that year.

[17] He made his Serie A debut for the first team in a match against Empoli, on 21 October, coming on as a substitute for Filip Kostić in the 84th minute.

[9] On 25 October, Iling-Junior made his Champions League debut against Benfica, replacing Kostić in the 70th minute with Juventus trailing 4–1.

[22] On 2 March 2023, Iling-Junior started the first leg of the final of the Coppa Italia Serie C with Juventus Next Gen and scored a 47th-minute equaliser against Vicenza, against whom they lost 2–1.

[23][24] On 11 April, he also played the second leg, in which he kicked a penalty he had won over the post at the 90th minute; they lost 3–2 (5–3 on aggregate).

[25][26] On 7 May, he made his first start in Serie A and scored his first goal with Juventus' first team, netting the opener in a 2–0 away win over Atalanta.

[29] On 1 July 2024, Iling-Junior signed for Premier League club Aston Villa on a permanent deal, as part of a double-transfer from Juventus, alongside Enzo Barrenechea.

[47] On 11 September 2023, Iling-Junior made his England U21 debut in a 3–0 win away to Luxembourg in a 2025 UEFA European Under-21 Championship qualifying match.