The Belgian international midfielder has impressed at the Bundesliga side this season, scoring six goals in 28 appearances.
Hunt told Bild: "It will be a loss, but we cannot dwell on it. The fact he wants to play in Europe and Chelsea want that for him too is logical. I predicted it.
"Kevin has had a very good season with us, but now it is time for Werder to look for an adequate replacement."
De Bruyne has yet to make a first-team appearance for Chelsea after signing for the club in January 2012 from Genk.