Spanish retailer Dia is exploring the possibility of selling its business in Portugal, where it operates under the Minipreco banner, according to reports in Jornal de Negocios and Inforetail. The company currently has 499 Minipreco supermarkets in the country, 297 of which are said to be operated under franchising arrangements. Dia also owns three distribution centres in Portugal. The retailer has hired Societe Generale as a financial advisor to study …