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Kostas Fortounis played for Kaiserslautern, a German football club based in Kaiserslautern, Rhineland-Palatinate. Fortounis joined the club in 2014 on a free transfer from 1. FC Köln. He made 28 appearances for Kaiserslautern, scoring 5 goals, before leaving the club in 2016 to join Olympiacos.