 De Zeeuw was presented to the Ajax fans ahead of a match between Ajax and Atlético Madrid during the Amsterdam Tournament.He made his professional debut for Ajax on 2 August 2009 in a 2–0 away win against FC Groningen.De Zeeuw scored his first Eredivisie goal for Ajax on 29 September 2009 in a 3–0 victory over ADO Den Haag at the Amsterdam ArenA.