Speaking before his talks with Croatian Prime Minister Jadranka Kosor, Cameron said that that today was a historic day and that in his opinion Croatia belonged to the EU.
Earlier in the day, European Commission President Jose Manuel Barroso said that the Commission had proposed to the EU Council of Ministers to close the remaining four policy chapters in Croatia's EU accession negotiations, paving the way for Croatia to become the 28th member in the European bloc on 1 July 2013.
Cameron said that Great Britain had been watching with admiration the political decisions made by Croatia over the last 10 years, and added that Zagreb was still facing many challenges.
Kosor, who is on an official visit to London, will address reporters after her meeting with Cameron.