Osmar, who led Persepolis to the title in the 2023-24 Iran Professional League (IPL), rejected to extend his deal due to family problems.
The 49-year-old coach had been appointed as Persepolis coach in January as a replacement for Yahya Golmohammadi.
Former Iran football team head coach Dragan Skocic is among the candidates to lead Persepolis.
Also, Croatia’s Petar Segrt and Montenegrin coach Nebojsa Jovovic are candidates to take charge of Persepolis.