Mirko Barisic has confirmed the promising young duo are set to be sold this summer, though he insists at least one of them will remain on loan for another seasonTottenham.
The 17-year-old duo have attracted interest from several of Europe's top clubs since breaking into the Dinamo first team, and Goal understands Spurs are leading the chase.
Barisic admits he is resigned to losing both this summer, but insists he is hoping to keep at least one of his prized assets on loan for another year as part of any deal.
"We agreed with their future club, that one of them remains at least another year with us," Barisic told Sportske Novosti.
"For now we cannot confirm to which club they are going but it is true that they are both leaving.
"It is just too early to talk about the club which bought them. We will confirm that when everything will be sorted out.
"The transfer fee? 20 million euros (£17m) is - let us put it this way - the right number."