Two Irish restaurants were forced to close for a number of days in June by the Food Safety Authority.
Indian restaurant Dera on Parnell Street in Dublin was closed due to "live and dead cockroaches" found near where food is prepared.
The FSAI inspector said that the infestation posed a "serious risk" to food being contaminated.
The Parnell Street spot was issued with the order on June 5 and was allowed reopen on June 8 after complying with the recommendations.
Giovanni's in Rampark, Jenkinstown, Co Louth was also asked to close after failing to comply with a previous improvement order.
They were shut on June 11 and allowed reopen a day later.
Dr Pamela Byrne, Chief Executive, FSAI, emphasised the need for food businesses to have adequate pest control systems and robust food hygiene practices in place.
Dr Byrne said: "The Closure Orders in June demonstrate the importance of all businesses operating to the highest standards of food safety as the country continues to face this public health pandemic.
"Many food businesses are reopening to customers having been closed for a number of months. Food business owners need to ensure that there hasn’t been any pest activity in or around their premises.
"Now is the time to carry out a deep clean of a food business to ensure that all food contact surfaces and utensils are clean and safe for use. It is a legal requirement for all staff working in food businesses to be supervised and/or trained in food safety and hygiene.
"It is not acceptable that last month’s Closure Orders showed that a number of food workers at these food businesses did not have even a basic knowledge or training in food safety and hygiene."
