The 17-year old defender has joined the Magpies from Swiss club Servette on a three-and-a-half-year deal.
"I am delighted to join Newcastle United," the Switzerland U19 international told the club's official website.
"Today is a big day for me. I've always wanted to sign for a club in the Premier League and Newcastle is one of the biggest there is.
"I want to finish my development here with the reserves before one day training with the first team and hopefully breaking into the first team."