Rost Com operates 15 stores in Brasov, central Romania, and Traditional Ecologic operates five stores in the Bucharest-Ilfov region, Carrefour said in a statement.
The French retailer and its new partners will soon draw up a plan to integrate the stores into the proximity store network operated by Carrefour.
Carrefour has 119 stores on the Romanian market in three retail formats: Carrefour hypermarkets (24), Market supermarkets (68), and Express proximity stores (27).
Carrefour signed a similar partnership with retailer Angst and last year bought six stores from Aliment Murfatlar Constanta, controlled by vegetable oil producer Argus Constanta (55.04%) and Dobrogea Grup (41.6%).
Carrefour registered sales of EUR986 million, VAT excluded, in Romania in 2012, up 3% on the year.