The Bournemouth forward had been tipped for an opportunity with the national team after progressing through every youth level, from the under-16s to the under-21s.
His promotion came on 10 November, when Thuram was released from the squad with a right hamstring problem sustained during Inter Milan's match against Como.
Speaking to the French Football Federation's media team, Kroupi reflected on the significance of finally joining the senior side after representing his country throughout his development.
“I have had all my France call-ups, from the under-16s to the under-21s, and to arrive with the senior team is just incredible. I am very proud to meet up with my team-mates again. It is a dream becoming reality.
“My first training session? We played a game and it was great to play with players like that. Even the intensity of the training was incredible. I am going to get to know everyone and I cannot wait to discover this team. I already know quite a few of them: Adrien Truffert, who I play with at Bournemouth, but also the young players who came up from the under-21s – Désiré Doué, Saël Kumbedi, Leny Yoro and Jérémy Jacquet.”
Kroupi's familiarity with several members of the squad should help him settle into the group, particularly Truffert, his Bournemouth team-mate. He also has connections with players who have made the same progression from the under-21s into the senior set-up.
The 20-year-old's call-up is a significant personal milestone, although it has come after a difficult start to the season. A foot injury required surgery during the summer and disrupted his preparations, limiting his involvement for Bournemouth before his return to action.
After joining Bournemouth from Lorient, he made a major impression in his first campaign in English football, scoring 13 Premier League goals. His performances had already placed him in the conversation for a senior international opportunity.
The France selection now gives Kroupi the chance to experience the senior environment first-hand. His immediate task will be to make the most of the opportunity, learn from the established internationals around him and build on the progress that has taken him through the national youth teams.