He began his career in Rudar Trbovlje and later coached many clubs in the Slovenian PrvaLiga, the highest level in Slovenian football, including Celje, Gorica, Rudar Velenje, Korotan Prevalje, Dravograd, Aluminij, and Mura 05.

Osmanović spent all of his playing career at Zagorje, formerly known as Proletarec, with whom he was the champion and thus qualified for the first season of the Slovenian PrvaLiga after Slovenia gained independence.

With Gorica, he became the runner-up of the 1999–2000 season of the Slovenian PrvaLiga, entered the semi-finals of the 1999–2000 Slovenian Football Cup and played four matches in the UEFA Europa League, formerly known as the UEFA Cup, making it one of the club's most successful seasons.

With Korotan, he won the Winter Futsal All Star League 2003 and entered the semi-finals of the 2002–03 Slovenian Football Cup.

[7][8][9][10][11][12] In 2001, Osmanović switched from Gorica to Rudar Velenje, and in 2002, took over Korotan Prevalje, with whom he became the champion of the Winter Futsal All Star League 2003 and qualified for the semi-finals of the Slovenian Football Cup.