Radjabali-Fardi made his Hertha debut on 17 July 2008 in the 2008–09 UEFA Cup first qualifying round 1st leg against Nistru Otaci. He played two more UEFA Cup qualifying matches, and Hertha's Europa League group phase match against FK Ventspils the following season, but never earned any caps for Hertha's first team in domestic competitions. After two and a half years on the bench, Hertha loaned him to Alemannia Aachen until the end of the 2011–12 season.
After joining Aachen on loan from Hertha, he made his debut on the 19th matchday of the 2. Bundesliga against Karlsruher SC, and scored his first goal a month later in Aachen's 3–1 win over SC Paderborn 07. Over the course of the loan, Radjabali-Fardi played in about two-thirds of Aachen's matches, making 38 league appearances and scoring twice. At the end of the 2011–12 season, Radjabali-Fardi's loan expired and he returned to Hertha Berlin.