Findus' subsidiaries in France, Sweden and the UK have all said they might file lawsuits against suppliers over the weekend as the horsemeat scandal deepens.
In turn, some of these suppliers have announced their own lawsuits, said The Grocer.
Matthieu Lambeaux, head of Findus in France, said the company had been "deceived" and would file a lawsuit on Monday against an unnamed party for fraud, said the Financial Times.
The Observer reported that the scandal has been linked to "both Polish and Italian mafia gangs" who are "running multimillion-pound scams to substitute horsemeat for beef during food production".
"There are claims that vets and other officials working within abattoirs and food production plants are intimidated into signing off meat as beef when it is in fact cheaper alternatives such as pork or horse," said the UK newspaper.
The scandal has also sparked images such as the one pictured here by Twitter user Pixel Pete to circulate online.
Supermarkets in the UK have pulled Findus lasagne products from their shelves, while over the weekend chains in France pulled Findus products including lasagne, moussaka and spaghetti bolognaise.
Findus was supplied by Comigel, which in turn was supplied by Spanghero, whose parent is called Poujol.