Mbappe made his first team debut on 2 December 2015 in Monaco’s 1–1 Ligue 1 home draw against SM Caen, replacing Fabio Coentrão after 88 minutes, becoming Monaco’s youngest-ever first team player aged 16 years 347 days and breaking Thierry Henry’s record set 21 years previously.
Mbappe scored the first hat-trick of his first team career on 14 December 2016 in the 7–0 rout of Stade Rennais F.C. in the Coupe de la Ligue round of 16 at the Stade Louis II- the first hat-trick scored by any Monaco player in the competition since Sonny Anderson in 1997.
The teenager excelled for Monaco last season and proved pressure is no burden to his success, scoring against Manchester City, Borussia Dortmund and Juventus as his side fell out of the UEFA Champions League at the semi-final stage while his goals paved Monaco’s path to winning the 2016-17 Ligue 1 title.
Mbappe was called up to the senior France squad for the first time to face Luxembourg and Spain in March 2017. He made his debut on 25 March 2017 against the former, coming on for Dimitri Payet in the 78th minute of a 3–1 2018 FIFA World Cup qualification away win.In doing so, he became the second youngest player (only behind Maryan Wisnieski) to ever feature for the French national team at 18 years, three months and five days old.