The Canadian Food Inspection Agency (CFIA) has suspended the operating licence of Establishment 232, Pinty's Delicious Foods Inc., in Oakville.
The plant will be closed until the company can meet CFIA standards.
The CFIA does not specify what it found deficient, but did say no products are under recall.
Olymel has an offer to buy the company and is awaiting anti-combines scrutiny and approval from the federal government.
Pinty’s main plant is in Port Colbourne and it has another plant in Paris. Poultry products are its main business which generates more than $300 million in annual sales.