The fullback insists Ronaldo has been very open with his new teammates - and vice-versa.
Sandro said, "I think he is a very talented football player.
"Wherever you play, your companions have something to teach you. I spent a short time with him, but I have already noticed how he is a person who helps and likes to be helped. He is willing to understand how the team works and how his teammates play.
"If there is a correlation between the fact that I am here (in the Brazil squad) and his arrival at Juventus? No, there is not. For bringing me here is only the excellent work done with the club and with the National team. Surely with CR7 at Juventus the whole world pays great attention to our games, but it was not he who brought me to Brazil."