The 25-year-old moved to Stamford Bridge in 2010, but has failed to make a single appearance in a competitive capacity for the Blues.
Chelsea are known for sending plenty of young players on loan, and Delac has had that treatment having been shipped off 10 times to various clubs.
"Yes, soon will come a time I'll have to leave Chelsea," Sportsport quotes Delac as saying. "Many people ask me do I regret coming to Chelsea so young, and not joining some smaller club, but I feel no regret.
"Your career can always be better, but I am 25 and have been through so much, met many coaches, players, gained experience. The problem was not my quality, Chelsea believed in me, extended my contract several times, but the problem was always work permit."
Delac spent last season on loan at Belgian club Mouscron.