An ethnic Croat,[citation needed] he started his career at NK Hrvatski dragovoljac at Prva HNL.
He then played for NK Dinamo Zagreb and Ukrainian side FC Metalurh Zaporizhya.
Bošnjak was capped twice for Bosnia and Herzegovina, he made his debut on 11 October 2002 against Germany, a friendly.
On 16 October he played his last match against Norway for European Championship qualification.
This biographical article relating to Bosnia and Herzegovina football is a stub.