Born to a French mother and Moroccan father, Louza has played for both countries at youth level and knows recent Wolves loanee Rayan Aït-Nouri and Brentford's Bryan Mbuemo from his time with Les Bleus.
Louza supported his hometown club Nantes prior to entering their academy as an eight-year-old but now he is ready for a new challenge and sees Watford as the perfect club at which to continue his development.
“I was very happy with the time I spent with Nantes, it is the only club I have been with,” said the 22-year-old.
“I took the decision that I want to continue my improvement and progression, so I am very happy to be here at Watford to achieve this. I wanted to discover a new culture, a new competition and a new league. I want to achieve some new challenges.
“My ambitions are first of all to adapt, and then to try to bring my personal touch to a successful team, and to improve the team.”