Leicester City
Monga began his career with Coventry City, before joining the Leicester City Academy at age eight to play at the under-9 level. He became the youngest Premier League 2 scorer on 1 November 2024 after scoring against Aston Villa. After impressing for the under-21s, he began training with the first-team. However, manager Ruud van Nistelrooy stated opportunities for Monga would be limited, considering his school commitments. He was included in the match day squad for their FA Cup fourth round match against Manchester United on 7 February 2025 at the age of 15 years and 212 days.
He made his professional debut for Leicester on 7 April, aged 15 years and 271 days, coming on as a substitute for Bilal El Khannouss in the 74th minute of a 0–3 defeat to Newcastle United in the Premier League. In doing so, he became the second-youngest player, behind Ethan Nwaneri, to play in the Premier League. Monga had to play in a sponsorless shirt, to comply with UK laws on gambling advertising. Van Nistelrooy praised Monga on his debut, saying, "He showed glimpses of his quality at such a young age." He finished his debut season with seven Premier League appearances.
Following relegation, Monga signed a new scholarship contract with Leicester in June 2025. He is expected to sign professional terms with the club when he reaches age 17 in 2026. On 13 August 2025, Monga became the youngest player to start a match for Leicester City, starting and playing 60 minutes against Huddersfield Town in a 2–2 draw in the first round of the Carabao Cup. Three days later, Monga scored his first goal for the club in a 2–1 loss away to Preston North End, becoming the youngest goalscorer in Championship history at 16 years and 37 days old.
In summer 2026, he was linked with transfers to a number of Premier League clubs, including Arsenal, Brentford, and Manchester City.
