[7] In the following month, on 10 May, the 23-year-old Eucher earned his first and only cap for the French national team in a friendly match against the Netherlands, replacing Émile Sartorius, who had been retained in the North for his duties as an elector; France lost 4–1.
[1][2][8] A few months later, in October, the Union des Sociétés Françaises de Sports Athlétiques (USFSA) selected Eucher for the French B squad that competed in the football tournament at the 1908 Summer Olympics, but he failed to feature in a single game as they were knocked out in the quarter-finals by Denmark.
[3][9][10] Eucher helped AS Française win the 1908 Coupe Manier, which was awarded to the team composed of at least eight French players with the highest ranking in the USFSA Paris championship.
[11] On 18 April 1909, he started in the final of the Coupe Dewar in 1909 at Stade de Charentonneau, which ended in a 0–5 loss to Gallia Club.
[13] On 5 March 1911, Eucher played an international match against English club Weybridge, helping his side to a 4–1 win.