Paul Clancy says the situation is getting “more confusing by the day”.
He has called for leadership and clarity from the Stormont Executive over what is deemed as essential services.
“Take for example the food supply chain,” he says.
“That does not just consist of places that produce foodstuffs, but there is also a huge supply chain supporting it from those that produce agricultural products, oil companies for heating and keeping lorries on roads, food labelling and packaging, to distribution.”
Mr Clancy says that should one of those links break “it will have an impact on the end product we have nothing on our supermarket shelves.”
“We urge the Executive to show leadership and work effectively with businesses and workers to outline what are essential businesses,” he says.