Plenković tweeted that he held talks with Bulgarian President Rumen Radev on economic cooperation and cooperation within the Initiative, migration, the fight against COVID-19, and the two countries' ambition to join the Schengen and euro areas.
Plenković also held talks with Estonian President Kersti Kaljulaid, who supported Croatia's Schengen bid.
"We appreciate Estonia's support in Croatia's ambition to become a member of the Schengen and euro areas," he tweeted.
Plenković and Kaljulaid also talked about economic cooperation, notably in energy and digitalisation, EU efforts in fighting COVID-19, and climate challenges.
He also met with representatives of the Amazon Web Service, tweeting that they talked about digitalisation in Croatia, plans for the company to open a regional centre in Zagreb, and cooperation in digital transformation, which he said would also create jobs.