Answer
Sparta Rotterdam was the club to which AZ loaned Haris Medunjanin. Medunjanin, a Bosnian professional footballer, joined AZ Alkmaar in 2008 and spent several seasons with the club. However, in search of regular playing time, he was loaned out to Sparta Rotterdam during the 2012-2013 season. This loan move provided Medunjanin with an opportunity to showcase his skills in a different Eredivisie environment.