Netherlands Vonk began his professional career at
RKC Waalwijk where he made 25 appearances in three seasons. He became first-choice goal keeper for
FC Wageningen, but was forced to leave after just one season, when the club went bankrupt and ceased to exist. Vonk returned to
North Brabant where he played for
FC Den Bosch, before joining his first club RKC, this time as their first keeper. His breakthrough came with his transfer to
sc Heerenveen, a club on the rise. They reached a domestic cup final in 1996–97 and finished second in the league in 1999–2000, resulting in
UEFA Champions League football the next season. After eight years, Vonk was approaching the autumn of his career. He left Heerenveen to become third-choice goalkeeper for Ajax behind
Maarten Stekelenburg and
Bogdan Lobonț. In a surprising turn of events, Vonk managed to play 26 games in two seasons.
First stint at South Africa After 18 years of professional playing Vonk left the Netherlands to return to his country of birth, and played 2 seasons for Ajax' satellite club,
Ajax Cape Town. He was terminated from his contract after a conflict with the coach of Ajax Cape Town, which made him a free agent.
Return to Netherlands Ajax signed him due to injury problems with their current goalkeepers
Maarten Stekelenburg and
Dennis Gentenaar, leaving the Amsterdam club with only one professional goalkeeper left:
Kenneth Vermeer. In the winter transfer window of 2008–09, with the regular Ajax keepers back in shape, he once again moved to an old club, Heerenveen to become second-choice goalkeeper behind
Brian Vandenbussche. He soon took over Vandenbussche's spot and played several league games, and another cup final, which Heerenveen won.
Second spell at Ajax Cape Town Continuing his tour amongst clubs he'd already played for, Vonk once again moved, this time back to his homeland South Africa, to play for Ajax Cape Town, citing family reasons, as well as sensing an opportunity to make the Bafana Bafana World Cup 2010 squad. == International ==