"I apologise to all our customers but I want them to know that we just don't have the people, it's as simple as that."
Segers also apologised to the retailers Tegal couldn't supply.
"They are the ones who deal with disappointed customers and we know that it puts them in a difficult spot.
"We really are doing all we can to fulfil orders. At this stage, it's just impossible to say when things will be back to normal."
At the company's Taranaki plant, 900 of the factory's 2300 staff were off sick.
And sausage production was down 40 per cent compared to its usual output of about 100 metric tonnes of sausages per week.
Segers said the volunteers from Tegel's head office, including accountants, planners and IT workers, had been drafted in to boost numbers on the production line at the plant.
"We have such a dedicated group of employees and they have been incredibly loyal through Covid but the reality for many businesses like ours around the country is we are operating in an unsustainable environment and are doing what we can under the current restraints," he said.
"I want to thank those volunteers and I especially want to pay tribute to our production people who are operating under immense strain, and putting in some massive hours to keep the lines running.
"It's a tough job at the best of times, and these are definitely not the best of times."
- RNZ