SkyCity's renowned Gusto at the Grand has temporarily shut its doors after multiple diners reported they were ill from suspected food poisoning .
A SkyCity spokeswoman confirmed the Italian restaurant was tested for contamination after a "small number of diners" reported they suffered from food poisoning after dining there.
The tests came back negative, but multiple diners reported that they became ill after dining at the restaurant or from The Grand room service between October 11-22.
The restaurant - whose menu was designed by famed Aussie chef Sean Connolly - voluntarily closed its doors yesterday to investigate further.
Hospitality general manager Callum Mallett said the company was undertaking comprehensive precautions to identify the possible cause and the supplies, surfaces and equipment had been thoroughly tested by external providers.