The Brazilian joined the Turkish giants during the summer after a temporary agreement was reached with the Old Lady.
"It's practically impossible to see me wear the Bianconeri shirt again," the 28-year-old is quoted as saying. "I don't want to go back.
"I always did my best for the team, but the Juve fans criticised me and that was a difficult period to live through.
"I absolutely want to stay at Galatasaray," he continued. "I love this club, the fans appreciate me and I am finally happy.
"Istanbul is a modern city and a beautiful place."