 Complete the following phrase:  He joined the Ajax academy in 2008. In 2015, Van de Beek made his competitive debut for the club in a UEFA Europa League match against Scottish club Celtic. In the 201617 season, Ajax progressed to the Europa League Final, but lost to Manchester United. During the 201718 season, Van de Beek established himself as a key player in Ajaxs starting eleven. Following the 201819 campaign, in which Ajax reached the semi-finals of the UEFA Champions League, Van de Beek was listed among the 30-man shortlist for the Ballon dOr. With Ajax, he won the Eredivisie title, KNVB Cup and 