Dutch prosecutors said they already started a criminal probe in mid-July into how fipronil, which can harm human health, got into the food chain.
But Van Lint, inspector-general of the Dutch food and consumer product safety watchdog, was adamant: "The reproach that we knew in November 2016 about Fipronil in eggs is wrong", he said.
"Similarly, in early July, a small quantity of liquid pasteurised egg, with a "use-by" date of 20th July, was supplied to a number of food businesses for use in bakery products".
British egg processors have accused retailers of double standards when it comes to their procurement - stocking fresh egg from the United Kingdom but buying cheaper continental egg for products.
Dutch authorities arrested two men Thursday on suspicion of involvement in the illegal use of the pesticide Fipronil in poultry farms.
Farmers dispose of eggs after tests found Dutch eggs contaminated by fipronil.
Heather Hancock, FSA chairman, said: 'I'm confident that acting quickly is the right thing to do.
But considering the figure only represents 0.007 percent of the eggs consumed in the United Kingdom every year, the agency said it is "very unlikely" that there is any risk to public health from consuming these foods. Based on the available evidence there is no need for people to change the way they consume or cook eggs.
Outside of the country of origin, five countries have announced to have been delivered in contaminated eggs.
It now believes that the number of contaminated eggs in the United Kingdom is closer to 700,000, rather than the 21,000 that it previously estimated.
In Denmark, 40 eggs from a farm affected by Fipronil have been found at a baker, Nikolai Kuhn Hove of the Danish Veterinary and Food Administration told Denmark's TV2 channel.
The core issue involves the use of Fipronil which is believed to have been used inappropriately in cleaning products on chicken farms, although it is not authorised around food producing animals.
In large quantities, the insecticide is considered by the World Health Organization to be "moderately hazardous" and can have risky effects on people's kidneys, liver and thyroid glands.
"At that time, there was no indication of an acute risk for food security".
It also emerged on Thursday that two managers at a Dutch company had been arrested during joint raids by Dutch and Belgian authorities.