Kammala jumla mai zuwa: Klementyev an fara zaɓar 122nd gaba ɗaya ta New York Islanders a cikin 2009 NHL Entry Draft. Ya fara buga wasan NHL tare da Islanders a ranar 27 ga Maris 2010 a kan Columbus Blue Jackets. 'Yan tsibirin sun zaba shi a zagaye na 5 (122nd gaba ɗaya) na
Zaɓin shiga NHL na 2009.