[1] After starting out at Spartak Subotica, Bošnjak joined Vojvodina in 1976.

He spent three and a half years with the club and won the Mitropa Cup in the 1976–77 season.

In 1985, Bošnjak spent half a year at Dinamo Vinkovci.

Later on, Bošnjak played professionally in Turkey (Gaziantepspor),[2] Spain (Figueres), and Belgium (Westerlo).

[3] At international level, Bošnjak was a member of the Yugoslavia under-21 team that won the UEFA European Under-21 Championship in 1978.