The Manchester City Great had his presentation at the weekend in Naples.
Lukaku said: “Have I advised De Bruyne to come? No, I didn't give him advice.
“He is a very simple boy, very attached to his family. The only thing I told him was to come here, to prove himself and to be ready, as he always did in Manchester City and with the national team.
“I have known him since we were 13; everyone knows our relationship. I am very happy that he is here, but it was he who made the decision to come to Napoli. And we are all very happy.”