After featuring in the club's opening two games of the season, the 22-year-old lost his spot and has now reportedly been forced to train with the reserves after a string of unsatisfactory performances in training.
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"This summer we decided to stay with Chelsea and we knew the competition would be hard and that Kevin had to fight," De Koster told Bild. "He will continue fighting.
"I have no contact to other clubs. Even if we were in the transfer period I would not have any contact."
De Koster, though, did reveal concern at his client's lack of playing time, suggesting a prolonged spell out of the first team could damage his chances of representing the Belgium national side.
He add: "For his stand in the national team it would be better if he played frequently."