[2] Gec began playing basketball for Crvena zvezda team in 1945, practically since its foundation.

[2] In July 1950, he was a member of the Zvezda squad that won an international cup tournament in Milan, Italy.

Four seconds before the end of the game, the score was tied when he took responsibility and scored with a shot from half court, but the crowd formed at the scorer's table and the judges ruled to overturn the point and then return the ball to his team.

[5] Gec become a head coach of Crvena zvezda in 1956 where he replaced Nebojša Popović on that position.

Gec is required to send a protest letter to the Director of Partizan, which was also the Minister of the Interior of Serbia.