Grațian Sepi, nicknamed "The Tank from the Balkans" or "The Brunette Sindelar" was born on 30 December 1910 in Valkány, Austria-Hungary, being his parents second child of three boys.

[4][9] In the 1932–33 season, The Red Caps reached the championship final which was lost in front of Ripensia Timișoara, Sepi managing to score a goal.

[2][3][4][12] In 1937 he went to play for Ripensia Timișoara where in his first season coach Sepp Pojar used him in 10 matches in which he netted seven goals which helped the club win the title.

[14][17] In a friendly against Poland from August 1931, after scoring a brace in the 3–2 victory, Sepi was praised by the Gazeta Sporturilor newspaper:"Today, Gați is just as popular in Warsaw as he is in Cluj.

[14][18] Sepi netted one goal in a 2–2 with Switzerland at the successful 1934 World Cup qualifiers, afterwards being selected by coaches Josef Uridil and Constantin Rădulescu to be part of the squad that went at the final tournament in Italy where he played all the minutes in the first round which was a 2–1 defeat to eventual finalists, Czechoslovakia.

[14][19] In the following years, Sepi played in two games at the 1935 Balkan Cup, making his last appearance for the national team on 8 July 1937 in friendly in which he was also captain, a 2–0 over Lithuania.