He was an attacker at Union at the start of the 20th century, where he scored an impressive 91 goals in 116 matches. He was known for his legendary shot. Coppée also scored easily for the national team: 9 goals in 15 matches. This included a hattrick in the quarter final of the Olympic football tournament in 1920 against Spain, and the opening goal in the final against Czechoslovakia from a penalty.