Keizer is Netherlands Youth's forward. He forms a two top with Johan Rensenbrink. In the first two matches against Japan in their campaign, most of Netherlands' goals were scored by him and Rensenbrink. He is inspired from former Ajax and Netherlands winger, Piet Keizer. (although in Captain Tsubasa: Saikyo no Teki! Holanda Youth, he resembled Ruud Gullit) He is part of the Dutch Olympic team, however he wasn't among the starting members in their match against Japan.