Transfer reporter Mounir Boualin reports that Peer Koopmeiners is expected to extend his contract with AZ in the near future. Coach Leeroy Echteld revealed after the victory in the Johan Cruijff Shield that negotiations with Koopmeiners are progressing smoothly. There is a verbal agreement on a one-year extension, which will keep Koopmeiners in Alkmaar until mid-2029. With the extension, Koopmeiners’ contract will also be upgraded immediately.

Voetbalprimeur.nl reports that AZ is making efforts to retain Peer Koopmeiners, a 26-year-old Dutch defensive midfielder, by extending his current contract, and that this desire comes amidst interest from other teams, including Club Brugge and Bologna. Koopmeiners joined the club in July 2021. In July 2026, it was reported that a bid from Club Brugge of €9 million plus €2 million in bonuses was rejected, with AZ's asking price cited as being between €12-17 million. According to Transfermarkt, Koopmeiners has a current market value of €12.00m.