AZ Alkmaar defender Gill Swerts fears they will lose Moussa Dembele.
Arsenal and Everton have been linked with the Belgian and Swerts said: "It would really surprise me if Moussa still plays at AZ after the winter break if he carries on as he is now.
"Because we're not playing European football with AZ, it makes it more attractive for clubs who want to bring in reinforcements during the winter break for those tournaments."