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Haris Medunjanin started his professional football career with AZ, a Dutch football club based in Alkmaar. He joined AZ's youth academy at the age of 11 and progressed through the ranks before making his first-team debut in 2006 at 17. Medunjanin quickly established himself as a key player for AZ and played over 100 matches for the club before moving to Heerenveen in 2010.