The 26-year-old French-born player has lastly played for Club Africain in Tunisia. Gharzoul also played for Sedan in France during 2008 to 2011.
Rah Ahan is fourth from bottom in the IPL standings table. The team is struggling to avoid being relegated from the Iran top division.
Ali Daei’s team drew with powerhouse Esteghlal 2-2 on Saturday.