[1] He even served as the club's secretary, having an office at rue Thomas d'Aquin, the address of the headquarters of FGSPF, from which he published several advertisements in L'Auto (the predecessor of L'Équipe), where he requested, for instance, friendly matches.

[1] Together with Auguste Tousset, Henri Mouton, Maurice Olivier, and Jean Ducret, Bellocq was a member of the Étoile team that won six FGSPF Football Championships (1905–07 and 1911–13),[1][7] and these victories allowed the club to compete in the inaugural edition of the Trophée de France in 1907, an inter-federation national competition organized by the CFI, which had just been founded by Simon.

[10] In the following year, on 4 May, he started in the semifinals of the 1913 edition against CA Paris, scoring the opening goal with an "unstoppable shot", but then conceding a penalty converted by Louis Mesnier in an eventual 2–4 loss.

[11] On 20 January 1907, Bellocq was the captain of a FGSPF team made up of players from the patronages in a friendly against the English club North London AFC, helping his side to a 4–2 win.

[3][4][5] In his fifth caps on 15 May 1910, a friendly against Italy in Milan, Bellocq scored once in a 2–6 loss;[1][3][4][5] the Italian newspapers wrongly attributed this goal to his club teammate André Sellier.

[1] Since that region belonged to the German Empire, Bellocq had to require a passport and visa to cross the Franco-German border in order to get married in Saverne, before returning to France.