[8] Ntilikina was invited to participate in the Jordan Brand Classic International Game in April 2014,[9] tallying six points, three rebounds and one assist in 23 minutes off the bench, and helped SIG to a French Youth League Championship title in the 2014–15 season.

[10] In February 2016, he attended the "Basketball Without Borders Global Camp" in Toronto, Canada, during the 2016 NBA All-Star Weekend.

[12] He had made his debut at the professional level even before the deal, seeing 15 minutes of action on 4 April 2015, in a French LNB Pro A 2014–15 season contest against Boulogne-sur-Mer.

After that night, he played his last game with SIG Strasbourg with them losing the LNB Pro A Finals to Élan Chalon.

[23] On 15 January 2018, Ntilikina recorded his first double-double with 10 points, 10 assists, seven rebounds, two blocks and a steal in a 119–104 win over the Brooklyn Nets.

[24] On 24 January 2018, he was selected to represent Team World for the Rising Stars Challenge during the 2018 NBA All-Star Weekend.

In the early part of the season, he took over starting point guard duties and began to show great signs of defense.

[33] Ntilikina averaged 7.4 points, 2.0 assists, 1.6 rebounds and one steal per game, en route to winning the 2014 FIBA Europe Under-16 Championship with the Under-16 French junior national team.

[37] Ntilikina dished out a game-high eight assists, to go along with 13 points and four rebounds, at the FIBA European Under-18 All-Star Game, in September 2015.