Ahold has insisted its business in the Czech Republic has not broken any laws after the country's antitrust body opened an investigation against the Dutch retailer over an alleged abuse of its market position.

The retailer, which runs the Albert chain in the Czech Republic, is accused of abusing its market power and the antitrust office, or the UOHS, is looking into the company's business practices in the country.

However, a spokesman for Ahold said the retailer was "fully co-operating" with the investigation but that it was "confident" it was operating within the law in the country.

"We believe that the way we do business is fully compliant with the law and we are fully confident about the outcome [of the investigation]," the spokesman said.

Reports have also claimed that Schwarz Group-owned Kaufland is also being investigated.

Earlier this year, the Czech government changed the laws governing the payment terms between suppliers and retailers in order to protect the country's food manufacturers.