Haas started his career in Mlada Boleslav, where he honed his skills at every level, from youth to professional. In Czech Republic Radek has also featured for clubs such as Stadion (Litomerice), Banik (Sokolov), Jestrabi (Prostejov), Slovan (Usti nad Labem), and Dvur Kralove nad Labem.
He has further showcased his talent abroad, representing the Finnish side Assat before concluding his stint with Icelandic club Skautafelag (Hafnarfjardar).
