Peer Koopmeiners has been identified as a potential signing for Celtic on a list of hypothetical transfers should Robbie Keane become manager. The AZ Alkmaar defensive midfielder is valued at approximately £10m and it is suggested he could partner Callum McGregor. Koopmeiners joined his current club in July 2021, has a contract until 2028, and has made 24 appearances in the 25/26 Eredivisie season.