The 20-year-old midfielder was on the brink of joining the Blues in a reported ?6.7million deal on a five-and-a-half-year contract that would see him loaned back to his current team for the rest of the season.
Asked if De Bruyne was at Chelsea for a medical, a Genk spokesmen told Press Association Sport: "Yes, that is correct."
The spokesman also confirmed De Bruyne would see out the season with the Belgian champions before returning to Chelsea in the summer.
The winger would then have to convince manager Andre Villas-Boas to make him part of the Blues' first-team plans, which could be tricky.
Villas-Boas admitted on Friday that Chelsea's pursuit of De Bruyne - who would become their second January capture after Gary Cahill - had nothing to do with him.