Bulgaria's Rumiana Jeleva will assume the portfolio of international cooperation, humanitarian aid and crisis response, the commission said in a statement. Meglena Kuneva is the country's outgoing commissioner and oversees consumer protection.
Romania's Dacian Ciolos will receive the agriculture and rural development portfolio. In the outgoing line-up, Romanian commissioner Leonard Orban is in charge of multilingualism.
Slovenian commissioner Janez Potocnik stays on but will switch portfolios going from science and research to environment.
Each of the 27 EU member states gets a seat on the commission, which is reshuffled every five years. The new line-up must gain approval from the European Parliament before it takes office for a term of office running until October 31, 2014. The vote of consent on the new commission as a whole is foreseen to take place on January 26.
"This college will implement the political guidelines that I presented to the European Parliament. I am confident that this college will be decisive in steering Europe towards recovery and a sustainable social market economy that works for the people,” Jose Manuel Barroso said presenting his new team.
Romania and Bulgaria joined the European Union in 2007 and Slovenia in 2004.