Dennis is the only Ajax graduate to play for Norwich City so far in the club's history. He never made the Dutch side's league team but competed for their youth side at the Montlaire tournament in France in 1982. He impressed the Norwich side who were also participating in the tournament and travelled back to Norwich to join theml.

Originally signed on a non-contract basis, Dennis made his first team debut against Everton on 18th September 1982 as substitute. In October 1982, he signed the first of four one year contracts with the club. Over the next four years, he would play in the full back and left wing positions for Norwich on 155 occasions scoring 4 goals. He was a member of the City side that won the 1985 Milk Cup final against Sunderland at Wembley.

In August 1986, having helped the side win the Division Two championship, he departed Norwich to experience pastures new. Belgian side Club Brugge KV was his first stop where he won both the Belgian League and Cup, and played in Europe. Greek side PAS Yanniana was his destination in 1990 before returning to Belgium with KSV Cercle Brugge (loan) and a second spell with Club Brugge. A broken leg ended his career and he ran a bar in Bruges.

According to Mike Davage's article "Canaries Flown From The Nest" in the 1998/99 club handbook, Dennis was coaching at Knokke and then with kV Oostende. He was then appointed technical director at Cercle Brugge. In June 2001, Dennis was linked with a move to FC Antwerp to take over as their manager. Cercle Brugge released Dennis, along with the rest of their coaching staff, in the early summer of 2002

At the end of November 2002, I was kindly informed via email that Dennis had been appointed manager of struggling Belgian Second Division side KSV Roeselare who had sacked Raoul Peters. The side from West Vlaanderen (the same province as Bruges) were one place off the bottom of the table when they appointed Van Wijk. Dennis turned things around at Roeselare winning them promotion via the play-offs into the Belgian first division in 2004/5. The following season saw new developments for the club. With an average attendance of 5500 (previously never more than 2000) it played an excellent maiden season in the Jupiler League. It ended 12th, and through the fair play competition it even qualified for the first qualifying round of the UEFA Cup.

Towards the end of 2005/6 Dennis announced he was leaving to join the Dutch club Willem II Tilburg. He hasn't had the best of starts though, as the club currently sits in 15th place, fourth from bottom in the Eredivisie

At the time of writing, Dennis has the second most number of appearances amongst Norwich's foreign players. Only former goalkeeper Sandy Kennon (South Africa) has more appearances.