Rubuta ci gaba don wannan sakin layi - A shekara ta 2006, Klien bai yi nasara ba idan aka kwatanta da abokin aikinsa mai kwarewa David Coulthard, kamar yadda dan Birtaniya ya zira kwallaye na farko na tawagar kuma ya fi dacewa fiye da Klien a cikin kakar wasa. A watan Agusta 2006, an tabbatar da cewa Klien ba zai kasance tare da ƙungiyar Red Bull ba don kakar 2007 mai zuwa, ko aƙalla a matsayin direba mai tsere, saboda sa hannun Red Bull na Mark Webber. Bayan kammala maki 2 a Bahrain da Jamus
, akwai wasu rashin tabbas game da inda Klien zai je gaba a cikin aikinsa na tsere, hasashe ya ba da shawarar Amurka a matsayin zaɓi mai ma'ana ga Austrian, amma ya ƙi wurin zama na ChampCar a cikin ƙungiyar da Red Bull ke tallafawa don 2007, ya fi son bin motar Formula One tare da wata ƙungiyar. A sakamakon haka, ƙungiyar ta sanar da cewa an sauke Klien don tsere uku na ƙarshe na kakar wasan a cikin goyon bayan direba mai gwajin Robert Doornbos.