Jan Jacobus "Sonny" Silooy (born 31 August 1963) is a Dutch former professional footballer and football manager. His last team as a manager was United Emirates squad Al Shabab under 19. His most successful time as a player was in his period with Ajax. He won seven Eredivisie titles, four KNVB Cups, three Johan Cruyff Shields, one UEFA Cup Winners' Cup, one UEFA Cup, one UEFA Super Cup and one Intercontinental Cup.