HŠK Zrinjski Mostar
Janjetović began playing football for HŠK Zrinjski Mostar. He spent the next several seasons in the Croatian first division playing with NK Hrvatski dragovoljac, NK Inter Zaprešić and NK Međimurje. In August 2008, he joined Russian First League side FC SKA Rostov-on-Don, and would return to the Croatian league after one season in Rostov.