The 18-year-old penned a five-year contract recently after previously trying to force through a move to Bayern Munich.
"The club have done so much for me and I'm so thankful for that," he told BBC Sport.
"The decision that I made was a very good one for me and my family. We all thought that it was the right club to be at.
"I've been here all my life, so there's no need to change yet. My mum and dad are happy where they are and I'm happy where I am."