Part of the same wave of enlargement was the accession of Bulgaria and Romania in 2007, who were unable to join in 2004, but, according to the Commission, constitute part of the fifth enlargement.
本轮欧盟拓展也包括了保加利亚和罗马尼亚在2007年的加入，虽然这两国无法在2004年加入欧盟，但根据欧盟委员会其在欧盟的第五次扩大中也一并加入了欧盟。