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. 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. ==International career==