Labour's ethnic communities spokesman Phil Goff is calling for the Government to clarify where and when Sikhs can wear a kirpan.
The Mt Roskill MP said there needed to be legislation on the matter to prevent any future confusion.
Seven Sikh cricket fans were barred from entering Eden Park to watch India play Zimbabwe in a Cricket World Cup match on Saturday because they were wearing kirpans.
The kirpan is a ceremonial sword or dagger carried by baptised Sikhs for religious purposes. To possess one is not unlawful in New Zealand, but the International Cricket Council considers the kirpan a weapon and bars it from venues.
Yesterday, Prime Minister John Key said he felt the ICC was wrong in barring Sikh fans from wearing kirpans at World Cup matches. He also signalled the Government could change Civil Aviation Authority rules to allow kirpans to be taken on flights.