The Brazil midfielder revealed: "When there was an interest from Milan in me, I was at Bayer Leverkusen, but I had already given my word to Roma and changing my decision would not have been easy.
"I remember that the meeting lasted only five minutes because I wanted to keep that promise to the Giallorossa club, but the interest of the Rossonera club pleased me.
"Now that I'm at Milan, I realise the greatness of this club. Milan protect their players and shows a respect reserved differently to other clubs. For a player to have such positive support is very important.
"When I arrived at Milan I saw some of my teammates who had been with this club for over ten years and I regret not having come here first time round."