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Ziyech joined Heerenveen's professional squad in 2012. He began his professional career with the Dutch club, making his debut in the Eredivisie in August 2012. Ziyech quickly established himself as a key player for Heerenveen, scoring 11 goals in 35 appearances during his first season. He continued to impress in the following seasons, helping Heerenveen to qualify for the UEFA Europa League in 2014.