"I didn't do it before because I was young and I didn't have the profile I have now," De Bruyne, who turns 28 next Thursday on the same day Belgium play England in their final Group G fixture, told RTBF television.
Both police officers killed in the attack were women.
Ibrahim El Bakraoui, who helped kill 14 people when he set off his suicide vest at Brussels airport on Tuesday, left the will in the bin of the terror cell's Schaerbeek safehouse.
News of all that's transpired on and off the football field
Tite was asked about reports that he was set to take charge of the Champions League winners during a news conference ahead of Sunday's friendly against Austria, although it was not clear where they had originated.
A superbly-executed strategy by coach Antonio Conte helped Italy to a deserved 2-0 win over Belgium in their Euro 2016 opener with outstanding goals by Emanuele Giaccherini and Graziano Pelle on Monday.
A round-up of Thursday night's matches from the Euro 2020 qualifiers.
News of all that's transpired on and off the football field