The Blues midfielder has been linked with a move to Bayer Leverkusen as part of a deal for Andre Schurrle, but the Champions League runners-up are confident of getting their man
The Belgium international has also caught the attention of Bayer Leverkusen, with CEO Wolfgang Holzhauser revealing in May that the versatile midfielder is set to join the club on a one-year loan move as part of the deal that will see Andre Schurrle move to Chelsea.
However, Zorc has insisted that the 21-year-old is not interested in a move to the BayArena as he wants BVB instead.
"De Bruyne only wants to join Dortmund," Zorc told Kicker.
The young midfielder joined Chelsea from Genk in January 2012, but has yet to make his first official appearance for the Europa League winners.
He was initially farmed out on loan back to Genk, before moving to Werder Bremen on a temporary basis for the 2012-13 campaign.
De Bruyne has a contract at Stamford Bridge until the summer of 2017.