He expects the investor to present its offer for the two companies next week, saying he only has the investor's letter of intent for now.
Janiska said the fund invested in the petrochemical business and had its own raw materials base.
He asked Crodux, a possible investor in Dina and Dioki, to say if it was still interested.
Janiska said the outcome was very important for Dina's legal status. The company's creditors have agreed to a settlement, but the High Commercial Court is yet to rule on Zagrebacka Banka's appeal against the settlement.
Dioki is in receivership because a settlement fell through.
Dioki shares on the Zagreb Stock Exchange have gone up in the last five trading days from HRK 5.85 to HRK 14.14 per share on Tuesday, as investors are likely encouraged by reports that a foreign investor is interested in the company.
(EUR 1 = HRK 7.6)