Mercator has announced that it slipped to a net loss of €22m during the first nine months of 2012.
Slovenia's largest food retailer slipped back on the €27m net profit that it made in the same period of 2011, Reuters reported.
According to the group, the result was impacted by lower economic activity in the region, as well as currency risks in Serbia.
Net sales for the period increased by 0.7 per cent to €2.1bn.
