In 1995, Kovač began working in the Office of the President of Croatia, in the Department of Information where he worked until 1999 when he assumed the position of assistant adviser for Euro-Atlantic integration. He began his diplomatic career in 2001 as a counsellor at the Croatian Embassy in Brussels. In 2003, Kovač became a minister counsellor at the Croatian Embassy in Paris. When the Croatian Democratic Union (HDZ) came into power, after the 2003 elections, Kovač assumed the position of Assistant Minister of Foreign Affairs, and in 2005 the Head of Diplomatic Protocol of the Ministry of Foreign Affairs. In 2006, Kovač was appointed to the position of ambassador. From 2008 until 2013 he served as the Croatian Ambassador to Germany.[4]
Kovač was appointed to the position of international Secretary of HDZ by its then-president Tomislav Karamarko in 2014. After his mandate in Germany expired, state officials had intended to appoint him the new Croatian Ambassador to Poland, but he refused and returned to Croatia in order to help HDZ in the upcoming presidential and parliamentary elections.
"La France, La création du royaume »Yougoslave« et la question Croate, 1914-1929", Bern, Berlin, Bruxelles, Frankfurt a. M., New York, Oxford, Vienna: Peter Lang, 2001., p. 398.
"Raspadanje Austro-Ugarske i rađanje Kraljevine SHS u svjetlu francuske politike (od listopada do prosinca 1918.)" (Break up of the Austro-Hungarian Empire and birth of the Kingdom of Yugoslavia in the light of French politics (from October to December 1918)), Časopis za suvremenu povijest, no. 1, 2003., p. 141-172.
"Francuska i hrvatsko pitanje, 1914.-1929." (France and Croatian question, 1914-1929), Zagreb: Dom i svijet, 2005., p. 363
"La Croatie et l'Union Européenne, 1990-2004", in: Lukić, Renéo, La politique étrangère de la Croatie de son indépendance à nos jours, 1991–2006, Laval: Presses universitaires de l'Université de Laval, 2006, p. 316[5]
