Answer
Fontaine began his professional football career at USM Casablanca, a Moroccan sports club based in Casablanca. The club is renowned for its football team, which competes in the Botola Pro 1, the top tier of Moroccan football. USM Casablanca has a rich history and is considered one of the most successful clubs in Moroccan football, having won numerous league titles, cups, and other prestigious trophies.