Lajcak said the standards for voter registration were high and that the media behaved in an acceptable manner.
He voiced hope that all forms of provocation would be avoided before the referendum on both sides and called on both blocs to honour the special law on Montenegro's independence, which was adopted with the EU's mediation.
Under the law, Montenegro's independence will be recognised if a minimum 50 per cent of registered voters take part in the referendum and if a minimum 55 per cent vote in favour of independence.
Lajcak said that both blocs were confident of winning. He added that if voters opted for independence, talks would begin on severing ties between Podgorica and Belgrade, which he said would be a technical process.
Lajcak said that if voters opted for the existing union, the state union of Serbia and Montenegro would likely be restructured. The Montenegrin government prefers a looser while Belgrade prefers a stronger union, he said, underlining the importance of Organisation for Security and Cooperation in Europe observers, who will be monitoring the vote on Sunday.