Here is a brief summary of his club career

Moukoko played in the under-13 team of FC St. Pauli Bundesliga 2 from 2014 to 2016 and scored 23 goals in 13 games as a striker. In July 2016, he was transferred to Borussia Dortmund’s youth academy. He played as the only 13-year-old in the Under 17 Bundesliga for Dortmund. Moukoko moved up to the under-19 team for the 2019–20 season at the age of 14, scoring six goals in his first match in the Under 19 Bundesliga in a 9–2 win against Wuppertaler SV. He completed his first UEFA Youth League match on 17 September 2019 against FC Barcelona, becoming the youngest player to be fielded in the competition. On 23 October 2019, Moukoko scored the opening goal in a game against Inter Milan, making him the youngest scorer in the Youth League. In total, Moukoko scored 141 goals in just 88 games for Dortmund’s under-17 and under-19 sides.