The Champions League holder is looking to part with the creative midfielder on a temporary basis for another season, and he appears to be on his way to Germany.
The German outfit believes that the 21-year-old attacking midfielder will be able to add creativity to the team, and the club is confident that a deal will be sealed when the Blues return from their preseason tour of the United States.
"We have already had a number of meetings with club and player in the past few months and we're in advanced talks," Allofs was quoted as saying by Kicker.
"Things are looking good, but it's not a done deal yet. We hope to wrap up the transfer next week when Chelsea are back from their preseason trip in the USA."
De Bruyne joined Chelsea from Genk in Jan. 2012, and was immediately shipped out on loan back to the Belgian giant until the end of the season.
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