Testing of Findus beef lasagne has revealed some of the product to contain horsemeat, the company has said.
Findus withdrew its beef lasagne from retailers in 320g, 360g and 500g sizes on Monday as a precautionary measure.
The company said all other Findus products had been tested and were not affected.
A spokesman said: "We are confident that we have fully resolved this supply chain issue. We do not believe this to be a food safety issue."
The company said the product was manufactured by a third party supplier and not by Findus.
The food contamination controversy arose in mid-January when Irish food inspectors announced they had found horsemeat in some burgers stocked by a number of UK supermarket chains including Tesco, Iceland and Lidl.
On Wednesday, the Food Standards Agency said it would co-ordinate a UK-wide survey of beef products to test for the possible presence of horse or pig DNA.
There will be "additional emphasis on brands at the lower end of the market, particularly for burger-type products," it said.
Twenty-eight local authorities across the UK will take a total of 224 samples, and results are due to be published in April.
The survey "aims to identify and understand factors that may lead to the presence of meat species that are not labelled as an ingredient, so that this can be explained, eliminated or correctly labelled."