He was also the first player from outside the British Isles to break the record of most association football international caps.

[3] After an argument with the FTC management team, he signed with the club's biggest rival MTK, and with them, he was the champion of Hungary a further 6 times.

He then spent a season at Wiener AC in Austria before returning to Ferencvárosi to help them to a double, winning both the league and cup.

[5] Schlosser made his debut for Hungary on 7 October 1906, aged 16 years and 361 days, in a 4–4 draw with Bohemia.

[7] He scored 5 hat-tricks for Hungary against the likes of Austria, France, Switzerland, Germany and Russia, the most notable of which being the one against Germany, because it handed his nation a 3–1 win in the 1912 Summer Olympics – Consolation tournament semi-finals, and Hungary went on to beat Austria in the final, where Schlosser scored the opening goal in a 3–0 win.