On Wednesday Rueuetel is due to meet with Mesic, Parliament Speaker Vladimir Seks, and Prime Minister Ivo Sanader.
Croatian and Estonian entrepreneurs are scheduled to meet at the Croatian Chamber of the Economy, and Rueuetel will also meet Zagreb City Assembly president Tatjana Holjevac.
On Thursday the Estonian delegation will visit the southern Adriatic resort of Dubrovnik.
President Mesic visited Estonia in April of 2003 and PM Sanader last November.