The Croatian joined the Blues from Inter Zapresic in 2010 and has been on loan at a number of clubs since then, including Vitesse, Vojvodina and latterly FK Sarajevo.
The 22-year-old is currently with the Chelsea first team but will go out on loan once more as he continues to learn his trade.
Delac told Sportske Novosti: "My contract expired but I signed on for two more years. But I will not stay at Chelsea because I cannot get a work permit. So I will spend another year on loan.
"But I don't know yet where I will go. There are several options. In one week's time it will all be sorted out.
"But for now I am just happy that I can be with the Chelsea first team."