In July 2018, Mbappé was given the number 7 jersey for the upcoming season with PSG, taking up the squad number vacated by Lucas Moura.
Sporting the hashtag #K7LIAN, Mbappé stated, "I keep trying to progress on the pitch and I think that, for me, it was the right time to change number.
It is something of an affirmation.
The No.
7 shirt is a legendary one and many greats have worn it.
I hope that I will be able to do this number justice on the pitch."

In his first appearance of the season, Mbappé scored twice in the last 10 minutes as PSG won 3–1 against Guingamp in Ligue 1.
In the following league game, the front three of Mbappé, Cavani and Neymar all scored in a 3–1 win over Angers at home, with Mbappé – starting his first game of the season – scoring from a volley and setting up Neymar to score the third.
On 1 September, he scored and assisted in a 4–2 away win over Nîmes, but was sent off for the first time in his career with a straight red card in injury time, after shoving Téji Savanier in retaliation for a late challenge from behind, for which Savanier was also sent off.
Regarding his sending-off, Mbappé told reporters after the match, "If I had the chance to do it over again, I would do the same thing.
I will apologise to the supporters and everybody, but I cannot tolerate this sort of thing."
On 8 October, Mbappé scored four goals in just 13 minutes in a 5–0 home victory over Lyon and became the youngest player (19 years and 9 months) to score four goals in one game in Ligue 1 over the last 45 seasons.
On 3 December, Mbappé was the inaugural winner of the Kopa Trophy, which is awarded by France Football to the best player in the world under the age of 21.

On 19 January 2019, Mbappé was one of two players (the other being Cavani) to score a hat-trick in a 9–0 win over Guingamp, breaking a record PSG set the previous season.
On 2 March, he scored twice in a 2–1 away win over Caen; his second goal of the match, which came from a penalty, was his 50th for the club.
On 12 March 2019, he scored the 2nd goal in a 0–4 away win against Dijon FCO in Ligue 1.
PSG finished the season as Ligue 1 champions, with Mbappé winning the Player of the Year award, while also finishing the season as the top goalscorer with 33 goals.
In July 2018, Mbappé was given the number 7 jersey for the upcoming season with PSG, taking up the squad number vacated by Lucas Moura. Sporting the hashtag #K7LIAN, Mbappé stated, "I keep trying to progress on the pitch and I think that, for me, it was the right time to change number. It is something of an affirmation. The No. 7 shirt is a legendary one and many greats have worn it. I hope that I will be able to do this number justice on the pitch."
In his first appearance of the season, Mbappé scored twice in the last 10 minutes as PSG won 3–1 against Guingamp in Ligue 1. In the following league game, the front three of Mbappé, Cavani and Neymar all scored in a 3–1 win over Angers at home, with Mbappé – starting his first game of the season – scoring from a volley and setting up Neymar to score the third. On 1 September, he scored and assisted in a 4–2 away win over Nîmes, but was sent off for the first time in his career with a straight red card in injury time, after shoving Téji Savanier in retaliation for a late challenge from behind, for which Savanier was also sent off. Regarding his sending-off, Mbappé told reporters after the match, "If I had the chance to do it over again, I would do the same thing. I will apologise to the supporters and everybody, but I cannot tolerate this sort of thing." On 8 October, Mbappé scored four goals in just 13 minutes in a 5–0 home victory over Lyon and became the youngest player (19 years and 9 months) to score four goals in one game in Ligue 1 over the last 45 seasons. On 3 December, Mbappé was the inaugural winner of the Kopa Trophy, which is awarded by France Football to the best player in the world under the age of 21. 
On 19 January 2019, Mbappé was one of two players (the other being Cavani) to score a hat-trick in a 9–0 win over Guingamp, breaking a record PSG set the previous season. On 2 March, he scored twice in a 2–1 away win over Caen; his second goal of the match, which came from a penalty, was his 50th for the club. On 12 March 2019, he scored the 2nd goal in a 0–4 away win against Dijon FCO in Ligue 1. PSG finished the season as Ligue 1 champions, with Mbappé winning the Player of the Year award, while also finishing the season as the top goalscorer with 33 goals.
Kylian Mbappé