Bellamy has joined as the Anderlecht under-21 coach.
"Bellers is amazing," Kompany said. "In chaos lies opportunity. He's one of the most driven people I've ever met in football.
"He stood up for the good of the team over the good of himself. Whenever you speak football with him, we're from the same family in terms of how we speak about the game. He's one of the guys with the biggest hearts I've ever known in football.
"I hear the story of a person I trust, so I have full faith in the outcome. I like honest people, he's a guy who will come to me and say, "Look Vince, you're wrong", and I like that – in fact I demand it. It's a no-brainer. I have not come here to look good – I've come here to do a good job."