Tielemans began his career at Anderlecht, where he made 185 official appearances and scored 35 goals across four seasons. He won the league title twice and in 2017 was chosen as the Belgian Professional Footballer of the Year. He is the youngest Belgian to play in the UEFA Champions League, making his debut in the competition at the age of 16 years and 148 days. After two years at Monaco in Ligue 1, he joined Leicester in 2019, initially on loan and then for an estimated fee of £32 million. He scored the only goal of the 2021 FA Cup Final.