German club Kaiserslautern is one of several clubs associated with Sem Westerveld, who is scheduled to leave AZ on a free transfer in the summer. The 23-year-old goalkeeper, who spent this season on loan at MVV, is also reportedly being monitored by Belgian side OH Leuven. Additionally, Athletic Club has an interest in Westerveld because he is eligible to play for them, as he was born in the Basque Country.