アルメレ・シティFC
Sven Nieuwpoort joined the youth ranks of Ajax in 2003 at the age of 10. He worked his way up through the youth ranks, until he signed his first professional contract, a two-year deal with Ajax on 21 December 2011, binding him to the club until July 2014. He was given the number 38 shirt and was on Frank de Boer's list of registered players for the 2012–13 UEFA Champions League campaign, practicing with the first team in De Lutte during trainingscamp, and playing alongside them in friendly encounters during the pre-season. The 2012–2013 season saw Sven playing in the Beloften Eredivisie with the reserve squad Jong Ajax. Not being called up to play for the first team before the winter transfer window, Nieuwpoort was loaned to Almere City FC for six months, for the remainder of the season, in order to obtain more experience in the Eerste Divisie, playing for AFC Ajax partner club in Flevoland. While at Almere City, Nieuwpoort was rejoined by his Ajax teammates Henri Toivomäki and Gino van Kessel, all serving loan spells in Almere. Sven made 15 appearances under manager Fred Grim, and finishing 14th with Almere CIty FC in the Eerste Divisie. Before returning to Amsterdam, while his younger brother Lars Nieuwpoort signed a two-year contract with Almere City FC.